How Beaver Drove Men Mad As Hatters

In 17th-century New France, the most valuable thing in the wilderness was a beaver. Not for its meat. Not for its lodge-building engineering. For its underfur — microscopic barbed fibers that, when compressed with heat and moisture, interlock permanently into a felt so waterproof and shape-retaining that no other material on earth could match it. Europe's aristocracy wanted hats made of nothing else. The demand was insatiable. And the men supplying it were criminals.

The coureur des bois — literally, "runner of the woods" — went into the Canadian wilderness without government permission, traded directly with Indigenous peoples without a license, and faced arrest if they came back to Montreal. Some didn't come back at all. Those who did spent months entirely alone, wading waist-deep into freezing streams at dawn to check steel traps, skinning beaver in temperatures that froze the blood on their hands, eating what the forest offered and sleeping where night found them. The wilderness they moved through was so dense with life — beaver, elk, wolf, passenger pigeon darkening the sky — that it is almost impossible to picture from where we stand now.

The hat their beaver became, by the time it reached a Paris street, had passed through the hands of a hatter slowly going mad — mercury nitrate, used in the felting process, caused tremors, hallucinations, and neurological collapse so common in the trade that it gave the English language a phrase it still uses today.
This is the story of where that hat started.

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The water comes up to your thighs and it is very cold. You already knew it would be cold. You have been doing this for eleven years and you knew the moment you stepped off the bank into the current what the next twenty minutes would feel like. But knowing does not change the cold. It moves through the leather of your leggings and into your legs in the first seconds, and after that it is just a fact you carry, the way you carry the weight of the pack or the ache behind your eyes from sleeping badly on hard ground. You stop feeling it as cold eventually. You begin to feel it as the water, which is different. The water is something you are working in, not something that is happening to you. This is the adjustment, and it takes about thirty seconds, and you have made it hundreds of times, and it is still thirty seconds every time. You move upstream along the bottom, feeling with your feet for the beaver run. A beaver run is a groove worn into the stream bed by years of the same animal traveling the same path between its lodge and its food cache and its dam. The same route every day, reliable as a road. You feel it when your foot drops into it, a trough, maybe a hand's width across, the mud on its edges smooth and packed. You follow it ten feet to where you set the trap two days ago, reaching down to the dark water, and your hand finds the chain before it finds the trap, and the chain is taut, and something is on the end of it. You pull it up. A beaver, a large one, dead and preserved in the cold water, its eyes still open, its tail a flat paddle of scale leather the size of your hand spread wide. Forty pounds, maybe forty five, you have caught larger. You work the trap off its foot, reset the mechanism, restake the chain in deep water, where the weight will hold a struggling animal under, and you set the trap back in the run in the same spot where you found it. Then you wade back to the bank, with the beaver slung over your shoulder, and you sit on a route with the animal across your knees, and you begin the work of skinning it while your legs dry in the cold air. It is before sunrise. The river is gray and still. Somewhere in the trees on the far bank, an owl is finishing its night. You have seven more traps to check before the light gets strong enough that you will need to make a decision about whether to eat first or move on. You are a long way from Montreal. How far exactly is difficult to say. You have been paddling and portaging for most of September, moving northwest out of Montreal along the Ottawa River, and then into the network of lakes and rivers that feed the Great Lakes, following routes that the Algonquin and Huron peoples have been traveling for generations and that the first French traders learned from them forty years ago. The canoe is cached on the lake shore three miles from here, turned over on two logs to keep the bark off the ground. Your camp is a half shelter of bent saplings and birch bark between two spruce trees, barely visible from twenty feet away, which is intentional. You are, by the standards of the government of New France, operating illegally. The colony prefers that its citizens stay inside the St. Lawrence Valley and let native peoples bring furs to the annual fair in Montreal. The men who ignore this preference and go into the interior themselves are called coureux de Bois. Runners of the Woods. There is no compliment intended in the name, but the men it describes have generally stopped caring what Montreal calls them. Your name is Giles. You are twenty nine years old, and you were born in a village outside of Rouen, France, and you have spent the last eleven years in country that no man born in France could have imagined when you left. You are going to spend the winter here alone, running a trap line through thirty miles of river and stream in territory you have trapped twice before, and know better than you know any street in any city. In the spring you will paddle back to Montreal with your furs bundled in packs, and you will sell them to a merchant on the waterfront, and you will have enough money to resupply for next year, with enough left over to spend a week being someone who lives in a city which will feel very strange and then feel normal, and then feel small, and then you will come back. This is the eleventh time you have done this. You do not expect it to be the last. To understand why a man born in France is kneeling on a riverbank in the dark skinning a beaver, you have to understand what a beaver is and what happens to it in Paris. The beaver is a large rodent that builds dams. This you probably already know. What you may not know is what is in its fur. The beaver has two coats, a layer of long, coarse guard hairs on the outside, and beneath those a dense, soft underfur that is as fine as anything the animal kingdom produces. It is this underfur that the hatters of Europe want. And what the hatters of Europe want, they have wanted for a long time. Because beaver underfur has a property that no other fur on earth shares, microscopic barbs on the surface of each fiber, invisible to the naked eye, that interlock permanently when compressed with heat and moisture. You can press beaver underfur into a sheet, boil it, pound it, stretch it over a mold, and it will hold whatever shape it is given indefinitely. You can soak that hat in a rainstorm, let it dry, and brush it back to its original form. You can do this for twenty years. The hat will outlast the man who bought it. No other material does this. Wool felts but degrades and loses its shape in weather. Rabbit fur can be worked into something passable, but it does not have the resilience. Beaverfelt is in a category of its own, which is why, by the time you were born, beaver felt hats had become the standard of European fashion for two hundred years and showed no sign of changing. A beaverfelt hat, properly made, communicated exactly one thing to everyone who saw it, that the man wearing it could afford to. The hat was not an accessory, it was a declaration. The making of the hat is its own story and not a comfortable one. The underfur, once stripped from the pelt, is treated with a solution of mercury nitrate before felting, a process the hatters call caratine because it turns the fur orange at the tips. The mercury opens the barbs on each fiber, making them interlock more readily and producing a tighter, stronger felt. It is extraordinarily effective. It is also poisonous. The mercury vapors in a hat workshop accumulate over years of work, and the hatters who breathe them develop tremors and slurred speech and deteriorating vision, and eventually something that looks very much like madness. The phrase mad as a hatter, which people in France say with a knowing smile when describing someone eccentric, is not a figure of speech. It is a description of what happens to a man who spends his working life in a room full of mercury fumes. The gentleman who wears the hat will live to old age. The man who made it may not. The pelt on your knees, once it reaches Montreal, will be inspected and grated and packed into a bale with hundreds of others and put on a ship to La Rochelle, France, where it will be processed at a tannery, stripped of its guard hairs, its underfur combed and carded, and prepared for the workshops. By the time it becomes a hat it will have travelled three thousand miles and passed through a dozen pairs of hands, and been transformed beyond any recognition. The beaver whose skin it was will be meat in your camp tonight. This is the arithmetic of the trade. But the pelt is not in France yet, and getting it there is its own story, and it begins with the canoe cached on the lake shore three miles from here. The canoe is birch bark, which is the only material that makes the interior of this continent passable for a man carrying freight. A birch bark canoe is roughly fourteen feet long, the right size for one man, and his gear and a season's worth of pelts, and it weighs perhaps forty pounds, which matters enormously when you consider how often you have to carry it. It is built from a single sheet of birch bark stitched with spruce root, and sealed with spruce gum along every seam, stretched over frame of white cedar ribs that give it its shape and its spring. The bark is on the outside, as nature put it, smooth side in. It flexes in rapids rather than shattering, which is why it survives conditions that a wooden boat would not. Hit a submerged rock at speed, and a birch bark canoe deflects and continues. Hit the same rock in a plank boat, and you are swimming. The Algonquin have been building these for longer than anyone can account for, and they are better at it than any French craftsman. A good one will last several seasons with proper care and regular repair. You have a small kit for the repair, a roll of spare bark, a coil of spruce root, a piece of dried spruce gum that you soften over a flame and work into cracks with your thumb. A seam that opens up on a wet day can be fixed at camp in twenty minutes. A more serious breach in moving water is a different matter entirely, which is why you inspect the hull every morning and fix small problems before they become large ones. The rivers between here and Montreal are not all passable. Some stretches are runnable, meaning you read the current from the bank, pick your line, commit, and paddle hard through the standing waves and around the exposed rocks, which requires a particular kind of attention that is not unlike the attention of a fight, complete and without room for other thoughts. Other stretches are not runnable by a man alone with a loaded canoe and no one to help if it goes wrong. These you portage. You unload the canoe on the upstream bank, carry the cargo to the downstream side in loads, come back for the canoe itself, carry it on your shoulders with the hull inverted over your head, and reload. A portage on flat ground is hard work. A portage on a rocky trail above a gorge in mud, with one hundred and fifty pounds of bundled pelts, is the kind of hard work that makes a man question his decisions. The calculation at every rapid is the same. Is the time saved by running worth the risk of losing everything in the water? You have made that calculation wrong in both directions. There is a set of falls on the Gatineau River, where you portaged out of caution the first time you ran it, and ran it the second time out of impatience, and the second time was right. There is a bend on the Ottawa River where you ran it the first time because the water looked manageable, and were nearly killed and portaged it every time after that. You carry both of these decisions with you the way you carry everything else, as information about the country and about yourself. The pelts travel this way for two weeks, portage by portage and rapid by rapid, until the Ottawa River broadens and calms in the last stretch above Montreal, and the current does most of the work, and you can rest your shoulders and watch the banks go by. Then the city arrives, and the merchant on the waterfront, and the bales on the ship to La Rochelle, three thousand miles in total. The hat at the end of it is very far from the river. Europe's own beavers were gone long before you were born. They were there once throughout France and England and the German states and beyond in every river that held cold, clean water, which is what beavers need and what Europe once had. The hat trade consumed them. By fifteen hundred they were scarce in most of Western Europe. By fifteen fifty they were effectively gone from England. The Russian and Scandinavian populations that briefly took up the slack were themselves declining by sixteen hundred. Then someone came to North America. What they found here is difficult to describe to a person who has not seen it and can now never see it as it was. The rivers of the Great Lakes country, where you have spent the last eleven years, hold beaver in numbers that the first traders from France genuinely could not communicate to the people they report back to, because the words for that many animals in that much space do not exist in French. Every stream has a dam, every pond has a lodge. In the morning, when the mist is still on the water and the light has just started, you can sometimes count a dozen beaver in a single stretch of river moving between their lodge and their cache with the purposeful efficiency of animals, who have a great deal to do before freeze up. No one hunted them here in any systematic way before the French arrived. They had no reason to fear humans. You can sometimes approach within feet of a beaver on the bank before it slaps its tail on the water and dives. You can, for now. The trade is young yet. The work of a single day on a trap line is this. You rise before first light, eat whatever is left from the night before, or nothing if there is nothing, and you walk or wade the line checking every trap. You have set traps on seven different streams within three miles of camp, chosen because the sign was good, fresh cut saplings near the water's edge, the pointed stumps, the beaver leaves when it fells a tree for food or damn material, drag marks in the mud where it has pulled branches into the water, the dome of the lodge visible above the surface of the pond. You set each trap in the animal's run at a depth that will hold a drowning animal under, but allow you to reach it by waiting. The chain is staked to a heavy log in deep water. A beaver, caught by the foot, will dive instinctively and the weight holds it down until it exhausts itself and drowns. A drowned beaver, preserved in cold water, will keep for days. A beaver that escapes the trap or is not held under will be lost, and it will also be suspicious of traps near that spot for the rest of the season, which means you move on. You skin what you catch, flesh the hide of any remaining tissue, and stretch it on a willow hoop to dry. A good pelt needs three or four days to dry properly. You are making hoops constantly. You have a small stock of finished pelts cached and wrapped at camp, and more drying on the rack you built from Greenwood the first week. In a full season, you might take a hundred and fifty beaver, more if the territory is rich and the winter is long. This is not a factory. This is one man with twelve steel traps and a knife and forty years of collective European knowledge about what a beaver hat is worth. The days are long in the way that physical days are long. You are up before dawn and useful until the light fails, and between those two points you are almost always moving or skinning or stretching or cutting or carrying. You eat once, sometimes twice, whatever the country provides. Deer are plentiful here, and elk, and in the ponds near the beaver dams, there are ducks in such numbers that you can sometimes take two with a single shot if you wait for them to bunch on the water. You eat well by the standards of any life you have known in France. The meat is fresh, and you eat a great deal of it, more than you would have thought possible when you were younger, because the work requires it. Eight pounds of meat on a hard day is not unusual. You do not think about this. You simply eat until you stop wanting to eat, and then you work, and then you eat again. What you wear is mostly leather and wool, some of it French in origin, and some of it made in the way the Algonquin make things, which is better for this country than anything France sends. Your moccasins are Algonquin work, soft leather lined with wool in the cold months. They are silent in a way that leather boots are not, and they tell you things about the ground you are walking on that leather boots cannot. You have learned more about wilderness travel from the people who have always lived here than from anything you brought with you from France, which is roughly the experience of every coure de bois, who survives long enough to be honest about it. The danger is real and various. The rivers are the first thing. Every portage is a calculation. How much weight can you carry across? How much ground before the risk of stumbling with a loaded pack on a rocky trail exceeds the risk of running the rapid? You have portaged when you should have run and run when you should have portaged, and you have come close to losing everything on both decisions. A canoe full of furs in a rapid is not something you can recover. You know men who did not. And then there are the winters. The winters here are not French winters. The cold that arrives in November is not the cold of Normandy or even of the mountains. It is a sustained cold that lasts four months and produces conditions that kill unprepared men as quickly and without drama as any animal could. You have been caught by sudden weather twice in eleven years, and both times you did what the algonquin taught you. You stopped moving, you built what sheltered the materials immediately around you allowed, and you waited. Both times you were cold enough, that waiting was a form of courage. Both times the weather broke before you used up your margin. You have a margin. Most of the time. The men who die in this country are the ones who forget that the margin exists and can be used up. What you do not think about very often, because thinking about it is not useful, is what you are looking at. The forest around your camp in late October is doing something that does not happen in France, or rather happened there once and does not happen anymore. The sugar maples have gone red and orange in a way that is not a gradual fading but an ignition, as if something in the tree has caught fire and is burning from the inside outward. The birches have gone yellow. The tamaracks, the only conifer that loses its needles, have gone gold. All of this color is happening at once, in every direction, on every slope, reflected in every still pond, and you have seen it ten times now, and it has not become less than it is. You do not have a word for what it makes you feel. There is probably not a word for it in French. There may not be a word for it in any language, which is perhaps why people who see it tend to stop talking and just look. The wildlife exists at a scale that you have stopped trying to describe in letters to anyone back in France, because you learned early on that accurate description produces the impression of exaggeration. Passenger pigeons travel through this country in October in flocks so large that the sound of their wings can be heard ten minutes before they arrive and ten minutes after they have passed, a continuous low thunder from a sky that is no longer sky because the birds have replaced it. The flock you saw last week took the better part of an hour to pass over the point of land where you were checking traps, and you stood with your face turned up for most of that hour, not because you needed to watch. But because you could not quite make yourself stop. The pigeons land in the beech forest and strip the mast in an hour and lift again in a mass so dense it bends the treetops with the downwash. There are three billion of these birds. You could not know that number. But standing under a flock of passenger pigeons in the Great Lakes country in seventeen hundred and four, you understand without being told, that you are in the presence of something that the world has decided to do on a very large scale, and that you are very small relative to it, and that this is not a complaint. The salmon runs earlier in the year can be pitchforked out of the shallows. You have done this not for sport, but because the fish were there, and it was the fastest way to get protein. The elk move through the valleys below the ridge lines in groups of forty and fifty, unafraid, because they have had no particular reason to fear whatever this creature is that arrived among them with its steel traps and its birch bark canoe. The beavers you are trapping have no concept of what you are. You are not a predator they have evolved to recognize. You are something new, and they are learning too slowly. Spring will come in April eventually, and the ice will go out of the rivers, and you will load your canoe with the season's take and begin the paddle back to Montreal. The run downstream is faster than the run up, and you will reach the city in two weeks or three, depending on the rivers. Montreal will feel very loud. You will sell your furs on the waterfront, at prices set by men who have never paddled a rapid or spent a night listening to wolves, and you will take what they offer because that is how the trade works. The merchant will pack your pelts into bales and send them to La Rochelle on the next ship, and they will become felt, and the felt will become hats, and the hats will be worn by men in Paris, who could not find the Great Lakes on a map of their own country. You will spend a week in Montreal, you will drink too much and sleep in a bed, and talk to people who have been in the city all winter and whose concerns are the concerns of city people, which will seem very far away to you, and then you will restock your powder and your traps and your trade goods, and you will put your canoe in the river, and you will go back. The beaver on your knees is skinned now. You set the pelt aside, cut out the liver, and eat it raw on the bank while the river goes from grey to silver in the first light. The Algonquin showed you this. Raw liver from a freshly killed animal is warm and it takes effect immediately. And after an hour in cold water at dawn, you want something that takes effect immediately. You have six more traps to check. The light is coming, you get up and go back into the river. What becomes of all this is the part of the story that nobody walking these rivers in seventeen hundred and four could have been told and believed. The sixty million beavers that were here when the French first arrived will be reduced by the end of the next century to populations barely large enough to survive. The trade you are part of will kill more animals in two hundred years than anything that has happened on this continent since the last ice age. The passenger pigeons you watched last week, three billion birds, will be extinct by nineteen fourteen, killed not by the fur trade, but by the logic it introduced. That what is here in such abundance cannot possibly run out. The last passenger pigeon will die in a cage in Cincinnati. Her name will be Martha. The bison herds of the Great Plains, which number thirty million animals in your lifetime, will be reduced to fewer than a thousand by eighteen eighty-nine. The wolves, the elk, the salmon, the run so thick you pitchfork them out as fertilizer, all of it will diminish so steadily and over such a long period of time that no single generation will fully feel the change. But you do not know any of this. You are standing in a river in October, with cold water to your thighs and your work ahead of you, and the maples burning on every hillside, and the world absolutely full of everything it has always been full of. You check the next trap. The chain is taut. You pull it up.