On spermatogenesis in the bat

ABSTRACT The following paper is the result of an investigation which I have made during the past year, in the Physiological Laboratory at University College, upon the spermatogenesis of the Rat, which, owing to the large size of its spermatozoa, and especially of the “middle piece,” presents peculiar advantages for the purpose. Although minor points of difference exist (in the relative length of the “middle piece “of the spermatozoon and in the shape of the “head “) the process is apparently in all essential points identical with that which occurs in other mammals, and hence may be taken as a type of “mammalian spermatogenesis?’