Regeneration . Fig. 63. — A. After Wetzel. Section through an egg (blastula stage) reversed at two-celled stage. B. After Schultze. Double embryo, from reversed two-celled stage, united ventrally. C, C^. Two views of another double embryo (united dorsally). C^. Cross-section throughlast. D. After Wetzel. Double embryo united laterally. Z)i. Section throitgh same. REGENERATION IN EGG AND EMBRYO 225 quickly added a part of the missing side. This reply fails, however,to meet Hertwigs description of the method of development of theembryos. Later w^ork, however, has put us in a position to give amo
Regeneration . Fig. 63. — A. After Wetzel. Section through an egg (blastula stage) reversed at two-celled stage. B. After Schultze. Double embryo, from reversed two-celled stage, united ventrally. C, C^. Two views of another double embryo (united dorsally). C^. Cross-section throughlast. D. After Wetzel. Double embryo united laterally. Z)i. Section throitgh same. REGENERATION IN EGG AND EMBRYO 225 quickly added a part of the missing side. This reply fails, however,to meet Hertwigs description of the method of development of theembryos. Later w^ork, however, has put us in a position to give amore satisfactory account of the differences between the results ofRoux and Hertwig. It seemed to me that the two kinds of embryosmight be due to the different positions of the eggs after the had been shown by Schultze (94) that if a normal o.^^ in the two-celled stage is turned upside down and held in that position twoembryos develop from the egg (Fig. 6-^, B, C, D). These embryosare united in var
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