Like many other nineteenth-century observers, Emerson and Thoreau were compelled to see time in a new light by developments in contemporary science: geologists were debating the antiquity of the earth, archaeologists were making discoveries in Egypt, and zoologists were attempting to unravel the mysteries of speciation and heredity. The discoveries effectively enlarged the scope of time, and consequently, exacerbated existing tensions between religious orthodoxy and scientific rationalism. This tension culminated in the ambivalent public reception that greeted Darwin's Origin of Species when it first appeared in 1859. Thoreau and Emerson were thoroughly aware of these wider cultural developments; and both tried, with varying degrees of success, to integrate contemporary scientific thought with their preexisting late-romantic idealism.
As romantics, the American transcendentalists regarded nature as a set of correspondences, formalized as symbols or hieroglyphics that could be decoded to discover the animating presence of eternal laws. Yet the transcendentalists hoped togo beyond merely understanding nature to achieving a kind of passionate identity with it, and this union could be achieved only by overcoming time. In their essays and poems, Emerson and Thoreau adopt a series of philosophical, rhetorical, and psychological strategies designed to jolt their readers out of time, often by attacking conventional and traditional notions about temporality.