[1][2] The work is an examination of naturalist Charles Darwin and the theory of evolution he proposed and marshaled evidence for in The Origin of Species.

A brief account of his visit to the Galápagos Islands brings up the issue of human origins, leading into a discussion of early theories on the formation and age of the Earth and evolution.

A biographical sketch of Darwin follows, covering his youth, his naturalistic studies on the voyage of the Beagle and subsequent life, focusing on his scientific researches and writings.

The history of the theory of human evolution as currently understood is then presented, with sections on the work of Mendel, the development of the science of genetics, and the Scopes Trial.

Isadora Kunitz, writing in the Library Journal, found the work a "well-written account of Charles Darwin's life and work," with "[d]etails about his personal life add[ing] to the interest of the book."