This paper examines the contents and institutional context of August Weismann's long essay on Amphimixis (1891). Therein he presented detailed discussions of his on-going studies of reduction division and parthenogenesis, but more to the point, he included an elaborate examination of Émile Maupas's two major publications in protozoology. To understand the relevance of this part to the other two, the author briefly reviews highpoints in earlier nineteenth century protozoology and concludes that only in the mid-1870s and 1880s did protozoa add (...) an important dimension to heredity theory. Otto Bütschli and then Maupas provided Weismann with a deeper understanding of how conjugation and fertilization were related but not identical processes. This allowed him to integrate the two into a fuller understanding of evolution by natural selection. (shrink)

It is commonplace to point out that Alfred Kinsey's taxonomic work on gall wasps provided a methodology for his studies of human sexual behavior. It is equally commonplace to point out that, when researching and presenting his sexual studies, Kinsey's professedly neutral scientific data were constrained by a social agenda. What I have done in this paper is to join these two claims and demonstrate, with particular reference to Kinsey's Sexual Behavior in the Human Male, how his zoology helped guide (...) Kinsey to a naturalistic ethics that, despite contrasts to, shared certain parallel logical failures with the traditional ethics of his critics. (shrink)

We began our survey at a time when Ehrenberg's functional principles concerning the design of all organisms prevailed in interpreting the taxonomic place and internal structure of Infusoria. Other options existed, such as Dujardin's sarcode theory and Siebold's cellular analogy, but these were not persuasive for reasons both relevant to and in addition to the microscopic observations. By mid-century other considerations, including the continuing search for complex life cycles and manifestations of sex, dictated the microscopist's rendering of infusorians. Müller and (...) his students saw spermatozoa and gonads; Stein envisioned alternating generations and generative nuclei; Balbiani found sexual behavior in the events of conjugation; and all interpreted the nuclei and nucleoli as gonads or gonadal products. Evolutionary theory provided a fourth dimension. Obsessed with phylogenies, particularly when joined with the germ-layer theory of development, Haeckel emphasized a structural interpretation and found a considerably altered cell theory ready to fill the breach.By the mid-1870s advances in cytology secured Siebold's original analogy. Infusorians now became single-celled organisms, the first in a long phylogenetic sequence that led to the “highest” metazoans. The analogy allowed Bütschli to invoke another biological principle, the physiological division of labor, to reinterpret the origin of the bisexual state. The ghost of Ehrenberg's polygastric theory had completely vanished. (shrink)