Books in Biology (sorted alphabetically by author)
- On the Genesis of Species St. George Jackson Mivart
- Facts and Arguments for Darwin Fritz Müller
- Lamarck, the Founder of Evolution: His Life and Work A. S. Packard
- Our Common Insects A. S. Packard
- Development of the Digestive Canal of the American Alligator A. M. Reese
- The Scientific Evidences of Organic Evolution George John Romanes
- Darwin, and After Darwin, Volumes 1 and 3 George John Romanes
- Love's Meinie: Three Lectures on Greek and English Birds John Ruskin
- Form and Function: A Contribution to the History of Animal Morphology E. S. Russell
- Darwin and Modern Science A. C. Seward
- Birds of Guernsey (1879) Cecil Smith
- Explanation of Terms Used in Entomology John Bernhard Smith
- Proefnemingen van de particuliere beweeging der spieren in de kikvorsch (Dutch) Jan Swammerdam
- The History of Insects Unknown
- Life History of the Kangaroo Rat Charles Taylor Vorhies and Walter P. Taylor
- Species and Varieties, Their Origin by Mutation Hugo de Vries
- Darwinism (1889) Alfred Russel Wallace
- Contributions to the Theory of Natural Selection Alfred Russel Wallace
- The Dawn of Reason; or, Mental Traits in the Lower Animals Jr. James Weir
- Text Book of Biology, Part 1: Vertebrata H. G. Wells
- The Evolution of Man Scientifically Disproved in 50 Arguments William A. Williams
- Biology : A lecture delivered at Columbia University in the series on Science, Philosophy and Art November 20, 1907 Edmund B. Wilson
- The Dancing Mouse: A Study in Animal Behavior Robert Mearns Yerkes
- Evolution in Modern Thought