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Some experiments and fundamental conceptions
The development of the vertebrate eye as an
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according already amphibian archenteron auditory vesicles Bautzmann beginning gastrula blastocoele blastomeres blastula Bombinator causal conception connection constriction cristatus defect definite differentiation dorsal Driesch ear vesicle early gastrula ectoderm experimental experiments eye rudiment F. E. Lehmann fact faculty field formation formative movements fragments gastrula gastrula of Triton germ germ layers glycogen Goerttler half Holtfreter host implant inductor influence invagination isolated larva lary plate later lens lenses limb Mangold mann marginal zone material median medul medullary fold ment mesoderm metabolism neural plate neural tube neurula neurula stage normal development notochord optic cup optic vesicle organs piece of presumptive posterior potencies presumptive ectoderm presumptive epidermis presumptive medullary plate question Rana esculenta region result Roux Roux's Arch secondary embryo self-differentiation side somites Spemann stage of development structure sumptive tested tion tissue tive transplanted Triton taeniatus trunk upper blastopore lip velopment ventral Vogt whole young gastrula