Early in the 20th century Clarence Day found success with his autobiographical book Life with Father. Day began as a stockbroker and then joined the Navy. His arthritis made him an invalid at an early age. In 1920 his first book This Simian World was published. This book consisted of a series of humorous essays and illustrations. The Simian World looks at man's simian characteristics. Day speculates on how man might have been better off if we had evolved from ants, bees, dogs cats, or even elephants. Clarence Day travels back in time to examine the species existing after the great saurians had been swept from the earth. Day's use of gentle satire helps make this book a delightful book to ponder.