Thoreau the scientist – how environmental research informed ‘Walden’ and later works

The steam locomotive chugged its way toward Cambridge, Massachusetts, on Aug. 15, 1859. On board was an impatient young scientist wanting to understand the math and science governing how river channels should behave. After disembarking at Harvard College and searching the stacks of its library, Henry David Thoreau checked out “Principes D’Hydraulique,” a three-volume tome of hydraulic engineering. Once he translated and transcribed 17 pages from the original French, he finally discovered what he was looking for: an equation for the equilibrium velocity of a stream, given its shape, slope, volume of flow and bed roughness. This theoretically minded, quantitative side of Thoreau is nearly invisible in the cultural zeitgeist. There, his other side dominates: the famous 19th-century transcendental nature writer, philosopher, social critic and abolitionist who lived for two years in a small house in the woods above Walden Pond in Concord, Massachusetts. This literary-minded, qualitative Thoreau is canonized and mythologized for “Walden,” a foundational text for America’s environmental movement, and for “Civil Disobedience,” which describes a model of nonviolent political protest later adopted by Emma Goldman, Mahatma Gandhi, Martin Luther King Jr. and many others. The nearly invisible Thoreau – the compulsively quantitative and analytically rigorous physical scientist…

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