Girdling the Maple

Consider the consequences if your largest blood vessels were coursing under surface of the skin instead of deep inside the body. I know it’s hard to imagine. But if the aorta ran the length of your back, branching out to limbs and major organs, the pulse wave might be visible and certainly palpable over the spine. The vena cava would return blood along the midline from belly to chest where it would plunge inside to the heart.  In a lean body this great vein would look like a bluish canal through the skin. Such a vascular anatomy offers no obvious advantages but there are several disadvantages, including a greater risk of hemorrhage. It wouldn’t take a deep wound to release a fatal gusher from either of these vessels; even a bruise might cause enough swelling to seriously affect returning venous blood.

sapsucker bore holesMy crazy musing began when I noticed rows of shallow, neatly-drilled holes encircling the trunk of our prized Japanese maple tree. This was the unmistakable signature of a yellow-bellied sapsucker which visits us in winter. Besides licking the sap, the bird finds insects that are attracted to the weeping holes so that its work generates carbohydrates and proteins for its diet. By springtime the sapsucker had left for its northern breeding grounds and the holes had dried up, but the fresh foliage was far less luxuriant than in previous years. Since I couldn’t find any signs of the tree being attacked by insects, molds or viruses I assumed the woodpecker had damaged its conducting vessels which, like the vascular anatomy in my imaginary person, lie just under the surface.

Yellow-bellied sapsucker by John James Audubon: Birds of America

Yellow-bellied sapsucker by John James Audubon: Birds of America

Although there is no circulatory system in plants the vascular tubes are somewhat analogous to blood vessels. Xylem carries water and minerals up from the root system, while phloem shifts the products of photosynthesis in the foliage to other parts. Between these two great highways lies the cambium consisting of a stem cell type (meristem) which generates new xylem and heartwood on one side and new phloem and tree bark on the other.

Trees could not have evolved conducting vessels deep in their boles because the inert heartwood would prevent their girth from increasing. But the price paid for this superficial distribution under the bark is a greater vulnerability to traumatic injury and infection. Where the sapsucker had been drilling the xylem and phloem was permanently damaged because cambium is not replaceable. Fortunately the harm to our tree is not fatal or as serious as lesions to

Frost damage in tree

Beech tree with frost lesion

others in our yard caused by frost or insect borers which expose heartwood to the elements and disease. Only by complete girdling, as American pioneers often did when clearing the eastern forests for farming, is a tree condemned slowly to an early death.

One day while hiking in l’Estrie when I lived in Quebec I came across a tiny shack with a lopsided metal chimney poking out of its roof.  I could have easily missed it deep in the maple forest, but curiosity forced by legs to follow the snow tracks of someone who had branched off from the beaten trail. I ended up at the front door, and because it was unlocked I stepped inside.

It was a dream house for a child. Every surface I touched felt sticky like cotton candy (candy floss). It was a sugar shack where maple syrup was still being made in the traditional way. There was a huge boiler in the corner standing over an open fireplace from which a chimney pipe ascended to the ceiling. This was where sap would soon be slowly evaporating to produce one gallon of amber syrup from every 40 gallons of thin fluid tapped from maple trees outside.

I didn’t have to look far to find those trees. Many of those more than nine inches in diameter had holes now vacant but which in previous seasons had held a spile from which sap would drain into a bucket. Some of them had multiple holes a few inches apart and often arranged in a spiral pattern. The harvesters had been more careful than my sapsucker to avoid harming the trees, but I can’t blame it when pancake days come round.maple syrup

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Candid about Cats

When a gray cat started prowling around our yard I assumed it was a new neighbor. I was wrong, she was a new resident!

I stumbled on her nest by chance a few days later. It was sheltered against the brick side of our house, and after scooting off from under my feet I noticed there were three tiny kittens in the nest. I guessed because their eyes were open that they were over ten days old, but not much more. The cutest kitty was tabby, another black as soot, and the third gray like their mother. She had chosen a safe place to nurse and hadn’t left a trail through the groundcover to attract attention.

cat nest

Nest of kittens

Soon afterwards a lady arrived from a non-profit rescue service with a pet carrier and a trap in the back of her SUV. She gets calls most days to abandoned cats, so collecting my family was routine. I greeted this dedicated volunteer with a cheer.

The queen was away from her nest when we returned, but the furry ball of kittens was still huddled inside. They didn’t object when we gently lifted them into the carrier.

But we had to play on their mother’s instinct to catch her. She was too shy to be enticed back while we were there, and much too wild to capture in our arms. So we set the trap back-to-back with the carrier and draped them with a cloth, leaving the entrance open. After crossing the threshold she would step on a pedal to make the door slam behind her. We waited indoors listening beside an open window.

I imagined her stealthily returning to peer through the tunnel to her babies in the carrier. Their cries would surely bring her back and overcome anxiety.  Three hours later in the gloaming we found her snarling in the trap.  Soon enough the family would be reunited in a large crate at the volunteer’s home.

queen cat

Queen in the trap

Before driving away the volunteer explained that healthy kittens are put up for adoption. Despite a rude start in life they would turn into fine home cats. But what about their mother—no one would adopt her? I presumed she would be euthanized.

Then I was told that she would be treated for parasites and tested for rabies and feline leukemia virus.  She would indeed be destroyed after weaning her litter if the tests were positive, but if not she would be spayed and vaccinated and released in our yard.

“NO…not in my backyard!”

There are many rescue organizations around the country that have a ‘trap-neuter-return’ policy. I suppose that preserving lives of unwanted animals helps to ease our collective guilt for the way that society maltreats and abandons them. Besides most people are appalled that millions of cats and dogs are euthanized, and we are moved by images of furry faces staring through the bars in animal shelters with faint chances of adoption. Who could find any satisfaction in dispatching an animal except for serious injury or chronic pain?

Tabby kitten

Tabby kitten

Some think it is unconscionable to kill any so-called feral animal that escaped from domestication or its wild descendants if a rescue shelter is available or it can be returned to a familiar place (like my backyard). I wish the same vehemence was expressed against hunting or trapping our native bobcat, because a dozen can be legally taken each year in Virginia. On the opposite side of the argument others believe it is imperative to cull cats that have gone wild, and persuade pet owners to keep all cats indoors. Municipal animal control officers have been very effective in keeping stray dogs off the streets. Roaming cats receive less attention because they rarely pose a danger to us and are better at fending for themselves than dogs. At least there is agreement between these two camps for promoting responsible ownership and sterilizing animals, apart from the genetically fittest for breeding. But because the numbers of feral and stray cats continue to soar there is a debate about culling them.

I understand that slaughtering unwanted members of a species that we chose as our companions seems a betrayal of trust. We might also feel sympathy for farm animals reared for food, but it is nothing like the bond between good owners and affectionate pets that depend on them. Moreover, it is easy for our warm feelings to diffuse over to the entire species, particularly for Anglos raised on a sentimental literary diet of Wind in the Willows and Watership Down. When I found a feral family in our yard I felt an acute conflict between as a pet owner on the one hand and a naturalist on the other, but the volunteer had no such dilemma. For her, life is always better than the alternative.

black kitten

Sooty kitten

When I protested that the gray cat would menace our wild birds, she replied: “For every fifty mice, voles, and baby bunnies brought home by my cats they only catch one bird.” There are of course many reasons why her cats are virtuous—they may prefer red meat to white or have heavy paws or the birds have plenty of cover in her yard, et cetera. But there is no longer any doubt about the national toll since the Smithsonian Conservation Biology Institute reported in a prestigious Nature journal. It found that outdoor cats killed 2.4 billion wild birds annually, including many of the most popular and beneficial species—cardinals, wrens, thrushes, bluebirds, and hummingbirds. In addition, they take 12.3 billion small mammals, but few rats. Feral animals and strays were responsible for more than half of the kills as they must hunt to eat, and domesticated outdoor cats can’t curb their instinct even on a full stomach. This stunning scale of butchery is contributing to the decline in common birds across North America and Europe and accounts for the extinction of several dozen species. The impact of cats and other introduced predators on native marsupials and flightless birds in Australasia is even better known.

The threat to so many native species should be sufficient reason for keeping cats indoors and curbing the rest, but welfare is another. Feral animals live in a shadow land between domestication and wild nature. Cats have evolved by human selection over eons and their behavior is no longer so well-adapted for life in the wild, especially far from their native range.  Given the opportunity cats wander outdoors, and often into jeopardy. The pitiful sight of a feline corpse by the highway is the most obvious reminder, but when researchers fitted cats with ‘Kitty Cams’ in suburban Georgia they were astonished at the sheer volume of hazards they face outdoors. The lives of semi-wild cats are even riskier and much shorter. They are burdened with parasites, threatened by coyotes, persecuted by people, exposed to wild weather and the threat of starvation, and lack any humane veterinary care. Pictures of a condemned animal in shelters pull our heartstrings, but there are millions of others in our cities and woods that suffer and perish out of sight.

I wonder if the consciences of people against culling feral animals could be appeased if we draw a mental boundary between them and Fluffy at home. Of course they look alike as members of the same species with indistinguishable genomes, even after generations of separation. The proof was also before my eyes since the kittens in our yard can become perfect pets. Isn’t it prejudicial to count the life of their wild mother as inferior, and call for termination? Is that a kind of catism?

gray kitten

Scary kitten

I remember as a kid worrying whether animals had souls, but grown-ups never gave me a satisfactory answer when I asked, “Do pets go to heaven?” I still think it’s a good question, though I’d frame it differently now. It would have helped if they had given me C.S. Lewis’s book The Problem of Pain. In a nutshell, he argues that if we have a personal relationship to God then our pets can be ‘ensouled’ through us. This is a strictly theological perspective and far from the biological view that humans are merely the most advanced model in organic evolution instead of a special creation. But leaving biology aside I venture some metaphysical inklings, although I admit they are speculative and our relationship to pets and their generous spirit remains deeply mysterious to me.

Lewis wrote, “in so far as the tame animal has a real self or personality, it owes this almost entirely to its master. If a ‘good sheepdog’ seems almost human that is because a good shepherd has made it so.” I too wonder if the ineffable bond with its owner gives a pet a deeper sense of its own self than their wild cousins ever have. Until recently, most animal behaviorists even denied that apes have much self-awareness, and I predict that research will challenge our thinking about other animals too.

To suggest that pets raised in a human home develop greater self-consciousness is skating on the thinnest ice and puts the writer at risk of being regarded as an anthropomorph, which is the cruelest label for a biologist. But while musing on ice a little longer I wonder if our animals can actually share crumbs of what we call ‘humanity.’  If so they might be able to share some kinds of mental suffering, like grief, that most scientists thought were strictly human. Skating even more dangerously near the melt zone I wonder if a greater sense of selfhood even increases their perception of physical pain. Pain is a subjective experience that is hard to explain to others and impossible to share compared to our five basic senses (seeing, hearing, touching, smelling, and tasting). We already know that pain is not always experienced the same by everybody: spinal mechanisms gate the ascending nervous pathways to the brain so that perceptions can be altered by states of mind. Perhaps our pets can suffer more than untamed beasts, and maybe I dismissed foxhunters too lightly for claiming their quarry hardly suffers at all. Of course this theorizing should never be used to justify maltreatment of animals which is always abhorrent and shameful.

We adopted a young stray cat. We called her Thursday and she lived with us indoors like a pampered princess for fourteen years, and for half of her lifetime in a Fifth Avenue apartment in New York. But she never returned affection, except with the threat of tooth or claw. It was my wife’s compassion that brought her home, but looking back I don’t think the cat ever had a soul!  Unlike the kittens we rescued Thursday was already too old to be imprinted by human kindliness. Taking her off the street had probably saved hundreds of birds and prevented her from making more of her kind, but it didn’t make a civil cat that deserved a place in heaven alongside our other house cat, John Henry. Cats are all the same, but are not all equal. If I see that gray mother cat prowling around our bird feeder again I will feel prejudicial, and hope my wife won’t sneak out to feed it.

Postscript: When the animal rescuer called a few weeks later we were told the cat was so ferocious that she had to be separated from her kittens. But since the viral tests were negative she had been spayed and released in our yard. We were told, not asked!

Next Post: Girdling the Maple

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Bee Swarm or Split

Beekeeping is like farming. All livestock—whether large animals with four feet or tiny ones with six—need food, water, shelter, and sometimes medication. Like an old farmer checking his herd in a meadow, I watch our ‘girls’ flying back and forth between their hive and the clover. But the parallels end there.

Modern farmers seldom have much cause for worrying about losing their stock unless there is a fence down or rumors of rustlers or the USDA issues an animal health alert. But beekeepers have to struggle with many insecurities, and the epidemic called colony collapse disorder is at the top of their list. But the most common loss of a bee colony is the most natural. Before running out of space the queen bee often abandons her hive in a swarm of thousands of workers.  That is the origin of hiving-off, a British expression for breaking away.

Shortly before exiting the hive, swarms gorge on honey to avoid starvation until scout bees have found a new home. Meanwhile, the workers that stayed behind in the hive prepare new queen cells by feeding a few of the youngest larvae with extra royal jelly. If swarming happens in early spring there is plenty of time for both the absconders and the home-buddies to build up their numbers and honey stores before winter, but if it happens in late summer the chances are poor.

A swarm in May
Is worth a load of hay.
A swarm in June
Is worth a silver spoon.
A swarm in July
Isn’t worth a fly.

18th Century English verse

When a swarm lands on a tree in a garden or on the side of a building the startled residents may be terrified, and someone calls a pest controller. What a pity! Beekeepers would love to take it away to start a new colony in an empty hive. A swarm is typically quite passive because the bees don’t need to protect their brood or honey in the comb. It can be gently transferred to a box for taking away.

We try to avoid bees hiving-off by ‘splitting’ the most fecund colonies in the spring. The only method I have tried is called a walkaway split because a busy beekeeper trusts nature to take its course.

Five frames of honeycomb, including pollen and nectar, capped honey, ‘capped brood’ (larvae), and very importantly one frame of eggs or very young larvae are transferred to a box for the new colony, or ‘nuc.’ Before closing the box thousands of bees are shaken off other frames to provide nursing services while guard bees buzz angrily around the beekeeper. Since the queen is left behind in the old hive and the workers in the nuc must create a new one, it is the opposite of swarming although both swarms and splits serve the same purpose of reproduction. If all goes well queen cups (larger cells) appear in the nuc a few days later, confirming that a royal succession is progressing.

bee hive

Queen bee cups (arrows)

To reduce the risk of swarming we split one of the strong colonies in the churchyard of Grace Church in Yorktown. Everything went according to plan. I sealed the lid and the entrance of the box with duct tape before loading it in the back of my SUV. Normally I transport bees in the trunk of a sedan car, but it had a flat battery that day. After stepping out of a hot bee-suit I could sigh with relief and look forward to getting the precious livestock home. But after driving only two miles and turning into Colonial Parkway something caught my attention in the rear-view mirror. There were bees crawling up the back window.

“Yikes, they’re getting out!” I mumbled (or something to that effect).

Luckily there was somewhere to safely pull off the highway. I jumped out of the car and dove into my bee-suit, getting the zip stuck when I pulled it too quickly. More and more bees were emerging as I continued to fumble. They were crawling off the window confused by the unfamiliar environment, but as they gained confidence they took off and some started dive-bombing. Now safely zippered in I wrapped so much duct tape around the box that it looked more like aluminum than wood. The escapees were eventually coaxed out of the car because I could never get them back in the box. They continued buzzing around after the door was closed and I hoped a guardian angel would lead them back to their hive.

Playing it safe, I kept my bee suit on for the remaining seventeen miles of the journey, although I folded the veil back for better vision. But after starting the car I noticed a police patrol car had pulled up behind me.

“Gracious! Have I been reported?” In the ten minutes I was standing in my voluminous white bee-suit dozens of cars had passed by. Perhaps someone was leery of me if they mistook my outfit for a hazmat suit and thought I was clearing up a chemical or radioactive spill at the roadside?

I waited for the officer to appear in my wing mirror. My finger was ready to lower the window for the expected interrogation. While I waited I wondered if there is a county ordinance requiring a special license for transporting livestock in a car? And if driving in a bee-suit is a traffic violation?  These seemed outlandish fears, but I know Virginia legislators are very imaginative.

However the officer stayed in his car with his head bowed either for reading notes or dozing off. So after a discreet interval I pulled out and drove away quite slowly with eyes flashing back and forth for a long time between the wing mirror, back window and road ahead. It was the longest journey home.

The following morning I wandered into the yard to check the nuc that was now in the apiary. After my perilous journey I glowed with satisfaction that the risk of swarming at the church hive was over and I would soon have a new colony. But perhaps I was too blasé and too close wearing only a t-shirt and pants because I felt something collide with my cheek and then a stabbing pain. Something was telling me to hive-off.

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Snake Hole

A snake has taken up residence in one of our bluebird boxes. Every morning three feet of coiled and blackened steel hose sunbathe on its roof.bluebird box with snake

Four species of snakes call our yard home. This one, the Eastern ratsnake, is the best climber and grows longer than garter or ring-necked snakes or the venomous copperhead. A six-foot ratsnake called George used to live in the woodshed owned an old lady next door. In one of our dry summers an itinerant garden worker knocked on her door asking for work. She wanted her parched lawn to be watered.

“Y’all find the hose in the shed,” Elspeth told him.

Next thing we heard the man screaming, and then watched him emerge from the shed and shake violently before running down the driveway. We never saw him again.

Eastern ratsnake

Home sweet home

Few people like snakes. Too few. The first impulse is to kill them and the second to summon their name when you need the most excoriating epithet. We curse with the names of all sorts of animals, but snake is reserved for the most despised and untrustworthy individuals, the lowest of the low. Don’t even check the Urban Dictionary for the meaning of ‘snakehole’.

The hole in our birdbox probably looked as homely to our snake as Bag End to Bilbo Baggins with its round, green door and brass knob—a cozy haven in an uncertain world. The snake may have found a clutch of blue eggs neatly laid out for supper in a twiggy nest, but I think it had been squatting there a long time. Either way, we leave it alone. It doesn’t bother us, although our species has been on bad terms with theirs for a long time.

“And I will put enmity between thee and the woman, and between thy seed and her seed; it shall bruise thy head, and thou shalt bruise his heel.” King James Bible.

Eastern ratsnake

Just a couple more feet to go

In the Jungle Book, Kaa (the snake) was one of the bad guys, although understandably grumpy when he was hit by Bagheera (the panther). He hissed:

“Ooh, my s-s-sinus. You have just made a s-s-serious mistake. And very s-s-stupid.”

Snakes prefer to avoid confrontation and are not aggressive by nature. In a court of law, they would not be condemned for defending themselves because most bites occur from our blunders—like poking or stepping on one, or testing fate in a snake-handling church. Over seven thousand snake bites from venomous species are reported in North America annually, of which only five or six become fatal. In Australia, home to the most venomous snakes, there are even fewer fatalities per head of population, but thousands of people die in India every year because medical care is insufficiently prompt or effective. We don’t have to exterminate snakes to save people from snakebites.

The only good snake is a live snake. A dead snake can no longer contribute to the good of the land as a slice of the food pyramid that dine on the lower orders while in turn being on the menu for top predators. They are friends to farmers and gardeners as ravenous predators of rodents that raid our crops and grain stores and which transmit Lyme disease, hantavirus, and plague in their fleas, ticks, and waste products. And for people with heart disease the venom of a rattlesnake has been used to engineer an antiplatelet drug (Eptifibatide).

We shouldn’t justify preserving snakes only when they help to satisfy our own needs. As wonders of nature, beautiful and mysterious, they deserve respect. But the sight of a snake more often triggers a tide of revulsion within us and the impulse to kill, as it did one hot day when a snake slither close to D.H. Lawrence who lay resting by a water trough.

And as he put his head into that dreadful hole,
And as he slowly drew up, snake-easing his shoulders, and entered farther,
A sort of horror, a sort of protest against his withdrawing into that horrid black hole,
Deliberately going into the blackness, and slowly drawing himself after,
Overcame me now his back was turned…

 Then Lawrence threw a log at it… But as the creature disappeared his heart started warming to it, and he realized he was enjoying its company.

… immediately I regretted it.
I thought how paltry, how vulgar, what a mean act!
I despised myself and the voices of my accursed human education.
And I thought of the albatross
And I wished he would come back, my snake.

For he seemed to me again like a king,
Like a king in exile, uncrowned in the underworld,
Now due to be crowned again.
And so, I missed my chance with one of the lords of life.
And I have something to expiate: A pettiness.

 Next Post: Beehive Split

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Citizen Science

Thomas Jefferson

Thomas Jefferson in Williamsburg, Virginia

At one time all scientists were amateurs. Most were gentlemen with private incomes like Charles Darwin or clergymen like the Rev. Gilbert White whose church stipend enabled him to spend spare time rambling in the Hampshire countryside. There was a rich crop of these men too among the founding fathers of America: Benjamin Franklin discovered electrical activity in thunderstorms by flying a kite, and Thomas Jefferson created an almanac by recording the weather for nearly fifty years. Today we call them citizen scientists, and after science became a paid profession they continue to flourish where many eyes are needed for collecting “big data.”

One of those sciences is astronomy, which was so memorably presented on BBC TV by Patrick Moore (1923-2012), and for which other amateurs are credited with discovering new exoplanets. Another is ornithology because birders supply tons of data to the Cornell Lab of Ornithology, the Audubon Society, and the British Trust for Ornithology. And the third—ever since Jefferson—is meteorology.

Years of recording temperatures and rainfall at Monticello helped him to plan the dates for planting crops in his garden. The data were also useful in the patriotic cause of proving the superiority of the Virginia climate compared to Paris where he lived at one time (there was no contest with London weather). In those times climate was thought to be fixed at a given place, just as the continents were believed to be immovable and species immutable.

Mark Twain wrote, Climate is what we expect, weather is what we get. But today the opposite is true because we no longer know what the future climate holds, and we have a firm expectation that weather will always be capricious. More than ever, climate scientists and weathermen/women depend on data from volunteers for modeling the atmosphere for days or even decades ahead.

Jefferson would have drooled at the equipment that is now available to backyard meteorologists. A starter weather station includes a thermometer, barometer, anemometer, hygrometer, and wind vane, but some really sophisticated equipment is affordable. The data can be uploaded to networks like Weather Underground which has more than 32,000 active stations worldwide. All data points are valuable because weather is local, and they contribute to a growing understanding of climate change.

rain gauge

Rain gauge for citizen scientists

You can join a network for the cost of a customized rain/ hail/ snow gauge ($30). This isn’t glamorous science like measuring glacier retreat, Arctic sea ice, or even sea levels and temperature, but data from your own backyard will be pooled with thousands of other observations for professional analysis.

Naturalists contribute data from monitoring wildlife and flora, which is called phenology. We are warned that if a warming trend continues the return dates of birds and butterflies that winter in warmer climes will be earlier, and they will breed further north. Hummingbirds arrived in Williamsburg today (April 12), but future generations may see them in March or even staying the year round.

Budburst is a phenology project for volunteers to record when trees and plants flower. A pollination by beesYoshino cherry tree in our yard bloomed the very same days this year as last, but we can’t assume the same in the future because this species is highly sensitive to temperature. Researchers in Seattle predict that cherry blossom will reach its peak 5-13 days earlier in Washington DC by 2050 than today (estimates vary depending on carbon emissions). If so, the National Cherry Blossom Festival and Parade will have to move forward to March.

It’s hard to say whether natural signs or physical measurements are the more reliable guides to the climate, but temperature and rainfall have the longest records.  The first frost dates in fall have been recorded in Williamsburg for over a century. Lately they have been getting later, and the growing season of frost-free days between spring and fall is correspondingly longer. The number of days when temperatures fell below freezing have declined by 20 days over the same period (notwithstanding the recent cold winter), which harmonizes with old stories when people drove across the frozen York River and skated on ponds.

first freeze

Date of first frost in Williamsburg, VA

It seems a contradiction then that average temperatures here in the hottest month of the year (July) are unchanged since records began in 1895 (78°F/ 25.5°C). Summer temperatures in Monticello (100 miles west) have also remained the same as when Jefferson recorded them, and it’s much the same story for rainfall. This leads people to wonder if the climate is really changing.

Jefferson as weatherman

Average annual temperatures in Virginia

But note the huge variances in the data. Our rainfall in July, which averaged 5 inches over the past 120 years, has a range of between 1 and 13 inches. You need data over a long period to prove a consistent trend in average temperature and rainfall with this statistical noise. But there have been more exceptionally hot days in summer here as elsewhere, and this may be the warning signal. We are so accustomed to paying attention to averages and medians (50 percentiles) that we can overlook the significance of outliers. I was reminded after an old cabin was taken down recently in the Allegheny Mountains when I was shown where the builder had scrawled in the joint between logs: June 6th 1878 frost killed beans.

Allegheny Mountains cabin

Frost killed beans 1878

Farmers and gardeners have always dreaded late freezes and heat waves, but if the climate becomes more dominated by freak weather we too will have something to groan about, and much more than scant snow on the piste or scorching sun on the barbecue. Amateur scientists today stand in a long tradition, but they are a different bunch to the gentlemen of yore who were led by private curiosity into the field. Today’s efforts by legions of volunteers are often propelled by a hope that through understanding nature we can better preserve it.

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