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thousand souls—a struggling colonial outpost, where Spanish families of rank often had less to eat than the mules that pulled their carriages.
    He arrived there alone. Ross Niven, the leader of the expedition (an expedition, by the way, that had consisted entirely of Henry Whittaker and Ross Niven), had died along the way, just off the coast of Cuba. The old Scot should never have been allowed to leave England in the first place. He was consumptive and pale and raising up blood with every cough, but he had been stubborn, and had hidden his illness from Banks. Niven had not lasted a month at sea. In Cuba, Henry had penned a nearly illegible letter to Banks, offering news of Niven’s death, and expressing his determination to continue on with the mission alone. He did not wait for a reply. He did not wish to be called home.
    Before Niven died, though, the man had usefully bothered to teach Henry a thing or two about the cinchona tree. Around 1630, according to Niven, Jesuit missionaries in the Peruvian Andes had first noticed the Quechua Indians drinking a hot tea made of powdered bark, to cure fevers and chills brought on by the extreme cold of high altitude. An observant monk had wondered whether this bitter powdered bark might also treat the fevers and chills associated with malaria—a disease that did not even exist in Perubut which, in Europe, had forever been the murderer of popes and paupers alike. The monk shipped some cinchona bark to Rome (that sickeningly malarial swamp of a city) along with instructions for testing the powder. Miraculously, it turned out that cinchona did indeed interrupt the path of malaria’s ravages, for reasons nobody could understand. Whatever the cause, the bark appeared to cure malaria entirely, with no side effects except lingering deafness—a small price to pay to live.
    By the early eighteenth century, Peruvian bark, or Jesuit’s bark, was the most valuable export from the New World to the Old. A gram of pure Jesuit’s bark was now equal in value to a gram of silver. It was a rich man’s cure, but there were plenty of rich men in Europe, and none of them wanted to die of malaria. Then Louis XIV was cured by Jesuit’s bark, which only drove up prices steeper. Just as Venice grew rich on pepper and China grew rich on tea, the Jesuits were growing rich on the bark of Peruvian trees.
    Only the British were slow to recognize the value of the cinchona—mostly owing to their anti-Spanish, anti-Papist prejudice, but also because of a lingering preference for bleeding their patients, rather than treating them with queer powders. In addition, the extraction of medicine from the cinchona was a complicated science. There were some seventy varieties of the tree, and nobody knew exactly which barks were the most potent. One had to rely on the honor of the bark collector himself, who was usually an Indian six thousand miles away. The powders one often encountered as “Jesuit’s bark” in London pharmacies, smuggled into the country through secret Belgian channels, were largely fraudulent and ineffective. Nonetheless, the bark had at last come to the attention of Sir Joseph Banks, who wanted to learn more about it. And now—with the merest hint of potential riches—so did Henry, who had just become the leader of his own expedition.
    Soon Henry was moving through Peru like a man goaded by the tip of a bayonet, and that bayonet was his own furious ambition. Ross Niven, before dying, had given Henry three sound pieces of advice about traveling through South America, and the young man wisely followed them all. One: Never wear boots. Toughen up your feet until they look like the feet of an Indian, forsaking forever the rotting embrace of wet animal hide. Two: Abandon your heavy clothing. Dress lightly, and learn to be cold, as the Indians do. You’ll be healthier that way. And three: Bathe in a river every day, as the Indians do.
    That constituted everything Henry knew, aside from the fact that