This pioneering work on experimental entomology incorporates Bonnet’s most important discovery–parthenogenetic reproduction–based on his study of aphids. Bonnet used the result of this and other discoveries as a basis for speculation about life on earth. This work presents in tabular form his version of the “great chain of being”. Bonnet’s concept of the essential continuity of life, a consequence of his discovery and preformationist interpretation of parthenogenesis, was a major force in the shaping of later evolutionary opinion. See No. 472.