Archive image from page 180 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 Fig. 51. — Embryo of Rana. The arrows show the direction of currents of water over the surface. A. Side view. B. Ventral view. (After Assheton.) the surface of the embryo. Before the neural folds have met in the middle line the ectoderm has become ciliated in certain regions, as can be demonstrated by the streaming movement of granules of carmine placed on the surface. The arrows in Fig. 51 show the direction of the flo
Archive image from page 180 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 Fig. 51. — Embryo of Rana. The arrows show the direction of currents of water over the surface. A. Side view. B. Ventral view. (After Assheton.) the surface of the embryo. Before the neural folds have met in the middle line the ectoderm has become ciliated in certain regions, as can be demonstrated by the streaming movement of granules of carmine placed on the surface. The arrows in Fig. 51 show the direction of the flow of granules over the sur- face. The lateral edges of the anterior end of the medullary folds seem to show the first traces of cilia, and a few hours later (Fig. 51, A) cilia have also appeared along the sides of the folds.
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