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.
Removal of this low factory dam across the Concord River in Billerica, Mass., was the center of contention for what may have been America’s first major environmental assessment.
Robert M. Thorson
The nearly invisible Thoreau – the compulsively quantitative and analytically rigorous physical scientist – emerged from my research as a geologist interested in the history of 19th-century science. With two decades of scholarly books and articles behind me, I’m now featuring this less well-known Thoreau in my upcoming book, “The Walden Experiments: The Science of Henry David Thoreau.”
Footnote to fame
Thoreau rose to fame as an original American thinker. He’s now the star of an award-winning video game. The Thoreau Alliance, an organization dedicated to educating about his life and legacy, is international. A recently released and highly acclaimed Ken Burns-Ewers brothers biopic, “Henry David Thoreau,” focuses on the usual side of Thoreau as a writer and activist, emphasizing his focus on environmental justice, sustainable living and the power of nature to heal our increasingly technological and frenetic lives.
Henry David Thoreau was a prominent 19th-century naturalist, environmentalist and writer.
Benjamin D. Maxham/National Portrait Gallery
I served as an adviser for and appear in the film, which touches on Thoreau’s science. These touches are limited mainly to his work as a biological naturalist. Examples include his pioneering insights on the dispersal of seeds, his anticipation of Charles Darwin’s theory of natural selection and his study of the seasonal…
