. Analysis of development. Embryology; Embryology. 196 affecting subsequent development it evidently has no special significance for the later events. Even when its elevation is inhibited, normal development can ensue (Tyler, '37; Tyler and Scheer, '37). If the unfertilized eggs are treated with such agents as isotonic urea or trypsin, that presumably dissolve the vitelline membrane, fertilization and cleavage can occur without membrane forma- tion (Moore, '30a,b, '32, '49). Of particular interest in this connection is the report by Hultin ('48a,b) that such treatment renders. Embryogenesis: P
. Analysis of development. Embryology; Embryology. 196 affecting subsequent development it evidently has no special significance for the later events. Even when its elevation is inhibited, normal development can ensue (Tyler, '37; Tyler and Scheer, '37). If the unfertilized eggs are treated with such agents as isotonic urea or trypsin, that presumably dissolve the vitelline membrane, fertilization and cleavage can occur without membrane forma- tion (Moore, '30a,b, '32, '49). Of particular interest in this connection is the report by Hultin ('48a,b) that such treatment renders. Embryogenesis: Preparatory Phases changes in volume of the egg upon fertiliza- tion. There are, however, conspicuous changes in shape in many species. Where such changes occur it is invariably in the direction of greater sphericity. Thus many species of echinoids have ellipsoidal, some- what irregular, eggs that become spherical upon fertilization. Such changes undoubtedly reflect changes in the rigidity of the surface and the viscosity of the egg contents (see Tyler, '32 and Runnstrom, '49, for further discussion).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Willier, Benjamin H. (Benjamin Harrison), b. 1890. Philadelphia, Saunders
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Keywords: ., bookcentury1900, bookpublisherphiladelphi, booksubjectembryology
