This paper is not presented as a contribution to our knowledge of the subject of the origin of sex, so much as an attempt to express concisely a theory of sex drawn from various sources, but principally from a work on the "Evolution of Sex" by Geddes & Thomson, a work which seems to me to mark an epoch in the science of philosophical biology.
Proceedings of the Iowa Academy of Sciences
©1895 Iowa Academy of Science, Inc.
Nutting, C. C.
"Origin and Significance of Sex,"
Proceedings of the Iowa Academy of Science, 3(1), 32-36.
Available at: https://scholarworks.uni.edu/pias/vol3/iss1/8