. Fig. 144. Section of active testis of Fin whale during the male sexual season. indicates unmistakably an active proliferation of germ cells, and a speeding-up in the production of spermatozoa. In Figs. 144 and 141 this active condition of the testis can be compared with the relatively passive condition. It happens rather often in a testis in the latter condition that the section of a tubule shows numerous spermatozoa which may be as abundant as in the active testis, but the distinction lies in the fact that

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscientificexpedition