Spermatogenesis of Bufo woodhousei: a thesis in zoology

Por a number of years the spermatogenesis of amphibians has been of interest to zoologists because (1) these are the first vertebrates to have emerged from the water during the process of evolution; (2) the sex chromosome relationship of reptiles has not been definitely determined, and research in this field has been disappointing; hope has been maintained that the amphibia may furnish some information leading to the solution of the problem introduced in the field of cytology by the heterozygosity of the male in mammals and the heterozygosity of females in birds. The purpose of this work is to see if a species of toad, Bufo woodhousei, will throw a light on the problem.