The post-nuclear body in the spermatogenesis ofCavia cobaya, and other animals

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Abstract
In a number of studies on spermatogenesis of molluscs, and in the annelidSaccocirrus, the senior author has drawn attention to the presence of post-nuclear granules, so-called, which take part in the formation of the ripe sperm. The possibility of the presence of such bodies in all flagellate spermatozoa will seem evident from what follows in this paper. This work will serve as an introduction to a study on the effect of X-rays on the spermatogenesis of guinea-pigs and other laboratory animals, which the writers at present have in hand. The senior author had already, in conjunction with Dr. Woodger, of the Middlesex Hospital, studiedCaviamaterial prepared by Cajal’s Golgi apparatus method, but the preparations which have been obtained with the chilled Da Fano method, on the lines advocated by Dr. Hope Hibbard, have been so remarkably good that it has been found possible to give a satisfactory description of these new bodies inCaviaspermatids.

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