Archive image from page 55 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 Fig. 15. — Stages in the segmentation (A, B, C) of the egg, and the beginning of gastrulation (D). AR. Beginning of archeuteron. SG. Segmentation-cavity. Up to the present time all the divisions of the cells started on the outside of the egg or blastomeres and progressed inward. As early as the eight-cell stage, a cavity appeared between the cells in the upper hemisphere of the egg. This is the 'seg- mentation-cavity.' I
Archive image from page 55 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 Fig. 15. — Stages in the segmentation (A, B, C) of the egg, and the beginning of gastrulation (D). AR. Beginning of archeuteron. SG. Segmentation-cavity. Up to the present time all the divisions of the cells started on the outside of the egg or blastomeres and progressed inward. As early as the eight-cell stage, a cavity appeared between the cells in the upper hemisphere of the egg. This is the 'seg- mentation-cavity.' It is filled with an albuminous fluid which
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