Abstract
1. The usual four types of cells, the spermatogonia, primary and secondary spermatocytes, and spermatids are discernible in the spermatogenesis of the pig.2. Large interstitial cells containing numerous mitochondria exist in great abundance and comprise about one fourth of the entire mass of the testes.3. Numerous Sertoli or nurse cells are present and great numbers of spermatozoa can be seen in all stages of development in the various tubules.4. Two large nucleoli are present in the resting stages of the spermatogonia. These can be traced through the entire Spermatogenesis of the pig and are apparently correlated with, or are the same thing as the two accessories. Smaller nucleoli, usually two, are also present.5. Eighteen rod-shaped chromosomes differing somewhat in size occur in all of the spermatogonia where a definite count could be made. Two of these, undoubtedly the accessories, can usually be seen to one side of the main mass of chromosomes.6. During the spermatogonial division the accessories div...
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