Abstract
THE testes of mammals and birds have two important functions. The first and primary function is to produce the specialized cells of reproduction known as spermatozoa. The second is the endocrine function, namely, to secrete the male hormone which influences the secretion of the secondary sex glands, the growth of the comb and wattles of birds, and the sex urge associated with reproduction.The source of the germinal cells in the seminiferous tubules of the testes has been recognized for many years. Recently, the writers (Kumaran and Turner, 1949) reported the results of a study of the normal development of the testes in the White Plymouth Rock. Emphasis was given to the stages in the development of the spermatozoa with advancing age although the interstitial tissue changes were also described.While it has been believed for a number of years that the endocrine activity of the testes is localized in .
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