This book offers a systematic exposition of the theory of evolution as it was understood in the late 19th century. The author, Alexander Winchell, was a geologist and biologist who sought to reconcile the concept of evolution with his Christian faith. He examines the scientific evidence for evolution, the philosophical implications of the theory, and its theological implications for the concept of God. The book was controversial in its time, but it remains a classic work of American natural theology.

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