. Analysis of development. Embryology; Embryology. 224 Embryogenesis: Preparatory Phases This occurs in the development of Nereis and Crepidula, etc. The mechanism of gastrulation has ap- pealed to many investigators who employ a physicochemical approach to the problems of development. Thus far, such attempts to explain gastrulation have been limited al- most exclusively to considerations of the mechanism of infolding of the entoderm to form the primitive digestive tract. Almost nothing has been done in elucidating the mechanism of exogastrulation. Thus, this apparently fruitfvil approach has
. Analysis of development. Embryology; Embryology. 224 Embryogenesis: Preparatory Phases This occurs in the development of Nereis and Crepidula, etc. The mechanism of gastrulation has ap- pealed to many investigators who employ a physicochemical approach to the problems of development. Thus far, such attempts to explain gastrulation have been limited al- most exclusively to considerations of the mechanism of infolding of the entoderm to form the primitive digestive tract. Almost nothing has been done in elucidating the mechanism of exogastrulation. Thus, this apparently fruitfvil approach has not yielded the anticipated results. Some of the mechanical factors accom- panying invagination have been studied. (1) It has been assumed generally that con- tinued increase in number of cells by divi- sion and growth in the wall of the blastula results in a lateral pressure among the cells, which causes an in-folding of the weakest part of the blastula sphere. However, by. 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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