Emerson frequently illustrates his philosophy with complementary scientific examples that clarify his ideas. This study examines Emerson's enumeration of the laws and powers of Intellect in conjunction with twentieth-century science, illustrating his ideas in the method he often employs. The physiological model of the two hemispheres of the brain parallels the two intelligences Emerson ascribes to man--understanding and reason. Hemispheric theories describe an analogue to the Emersonian epiphany-- hemispheric integration--and help to distinguish the epiphany from other experiences associated with altered states of consciousness. Quantum physics and relativity theory illustrate the vision of the unity of nature perceived during the epiphany. Using modern science to illustrate Emerson's ideas in this way makes us apprentice to a rhetorical technique used and advocated by him.