Abstract
The main results of this study may be briefly summarized as follows: 1. The spermatogonic chromosomes are joined together in pairs in the synapsis to form sixteen bivalent chromosomes. 2. A longitudinal splitting of the thread takes place at this stage. 3. The distinctness maintained by the chromosomes up to the formation of the nuclear network of the resting spermatocyte and the manner of origin of the spermatocytic chromosomes from it lends support to the theory of their individuality in the resting nucleus. 4. In the structure and mode of origin of the bivalent chromosomes two main types may be distinguished: (a) the com-ponent chromosomes lie end to end, or (b) they lie side by side. 5. Inasmuch as univalent chromosomes are separated, the first maturation division is reducing. 6. Sphere substance (idiozome) is not observable, except for a short time during the prophases of the first spermatocyte. 7. The nucleolus of the spermatogonia disappears shortly after dissolution of the nuclear membrane, while ...
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