his journey, adopting the moniker "Alexander Supertramp", after W.H. Davies. He spent time in Carthage, South Dakota, laboring for months in a grain elevator owned by Wayne Westerberg before hitchhiking to Alaska in April 1992. Krakauer interprets McCandless's intensely ascetic personality as possibly influenced by the writings of Henry David Thoreau and McCandless's favorite writer, Jack London. He explores the similarities between McCandless's experiences and motivations, and his own as a young man, recounting in detail Krakauer's own attempt to climb Devils Thumb in Alaska. Krakauer also relates the stories of some other young men who vanished into the wilderness, such as Everett Ruess and Carl McCunn. In addition, he describes at some length the grief and puzzlement of McCandless's parents, sister Carine, and friends. Cause of death McCandless survived for approximately 113 days in the Alaskan wilderness, foraging for edible roots and berries, shooting an assortment of game—including a moose—and keeping a journal. Although he planned to hike to the coast, the boggy terrain of summer proved too difficult, and he decided instead to camp in a derelict camping bus left behind by a road construction company. In July he tried to leave, only to find the route blocked by the Teklanika river raging with snow-melt. On July 30, McCandless wrote a journal entry which read, "Extremely Weak. Fault Of Pot[ato] Seed". Based on this entry, Krakauer hypothesized that McCandless had been eating what he thought was the roots of an edible plant, Hedysarum alpinum, commonly known as wild Eskimo potato, which are sweet and nourishing in the spring but become too tough to eat in the summer, perhaps forcing McCandless to eat the H. alpinum's seeds instead. Krakauer first speculated that the seeds were actually from Hedysarum mackenzii, or wild sweet pea, instead of the Eskimo potato, which contained a poisonous alkaloid, possibly swainsonine (the toxic chemical in locoweed) or something similar. In addition to neurological symptoms, such as weakness and loss of coordination, the poison causes starvation by blocking nutrient metabolism in the body. However, Krakauer later suggested that McCandless had not confused the two plants and had in fact actually eaten H. alpinum. Krakauer had the H. alpinum seeds tested for toxins and, through tests on Hendysarum alpinum, it was discovered that it contained an unidentifiable form of toxin. According to Krakauer, a well-nourished person might consume the seeds and survive because the body can use