الفهرس 
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Abstract
Since the norasl tissue of the testis in vertebrates under g0es certain environtental changes during the seusone of the year, hence it 12 necaesary to record informations concerning the seasonal eyeles of these cox glands which represent the major vertebrate types. Suoh informations are necessary for conparative purpoat well ae for the prelininery experinental atuties of reproduction probleas.