On October 13, 1939 (Friday), I was doing routine autopsy work on cottontail rabbits at the Zoological Laboratory, University of Wisconsin. The rabbits were box trapped at the University Arboretum, brought in alive to the laboratory, and later killed for endocrine and parasitological studies. The handling of wild rabbits called for care, so all necessary precautions were taken; such as rubber gloves, disinfection, and careful disposal of the carcasses.