. The eggs of mammals . Fig. 23 Fig. 24 Plate II. (From the Journal of Morphology) Figs. 17-22. Nuclei of ova from ovary of rat 20 days post partum. 17, Deuto- broch nucleus. 18, Beginning of the formation of clumps shown in next figure. 19, Modified pachynema. 20, Later stage showing characters of diplonema. 21, Nu- cleus toward the end of the growth period. 22, Final stage in twenty-day rat. Fig. 23. Nucleus in mature follicle from adult rat. Fig. 24. Nucleus from ripe follicle from adult rat. 13

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