. Analysis of development. Embryology; Embryology. 264 Embryogenesis: Progressive Differentiation When belly ectoderm of an anuran gas- trula is transplanted to the prospective head region of a urodele gastrula, it is in- duced to form suckers on the ventral side of the head (Spemann and Schotte, '32) and horny denticles in the mouth region (Holt- freter, '35b; Schmidt, '37; Spemann, '38; see Fig. 97). In the reciprocal experiment, head structures of the frog or toad induced bal- ancers (Fig. 98) and dentine teeth in the pros- pective neural ectoderm of a salamander evolution. This aspect has
. Analysis of development. Embryology; Embryology. 264 Embryogenesis: Progressive Differentiation When belly ectoderm of an anuran gas- trula is transplanted to the prospective head region of a urodele gastrula, it is in- duced to form suckers on the ventral side of the head (Spemann and Schotte, '32) and horny denticles in the mouth region (Holt- freter, '35b; Schmidt, '37; Spemann, '38; see Fig. 97). In the reciprocal experiment, head structures of the frog or toad induced bal- ancers (Fig. 98) and dentine teeth in the pros- pective neural ectoderm of a salamander evolution. This aspect has been stressed particularly by Baltzer and his associates, in their extensive transplantation experiments (Baltzer, '41, '50a,b; Andres, '49; Wagner, '49; Roth, '50). It seems that when structural divergencies originated in the course of evolution, the vmderlying inductive mechanisms were re- tained, in part, and they have remained a common property of both urodeles and anurans. The term "homodynamic" was pro-. 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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