IQO Edivin G. Conklin 



Partial Embryos from Isolated Blastomeres of 8-Cell or i6-Cell Stages. Drawx from 



Living Specimens. 



Fig. 71. Right anterior dorsal eighth embryo, 14 hours after injury, showing endoderm, chorda, 

 and neural plate cells with sense spots. 



Fig. 72. Right anterior quarter embryo, 14 hours after injury, showing chorda, neural plate, and 

 sense spots. 



Fig. 73. Posterior ventral quarter embryo derived from the cells b^-^, h*-"^ and containing no endo- 

 derm and only a small amount of yellow protoplasm which was derived from the perinuclear plasm of 

 the cells b*.^, Fig. 13. 



Fig. 74-76. Three views of a partial embryo derived from 7 cells of the 20-cell stage, viz: 2 (B^*'), 

 2 (b'-''), I (a'-''), 2 (a^*'). (c/. Figs. 3 and 4.) The embryo consists of an outer layer of clear ectoderm 

 and of a mass of yellow mesenchyme cells derived from the cells B^--, but it is wholly without endoderm. 



Fig. 74, Ventral view; Fig. 75, Posterior; Fig. 76, Postero-dorsal. 



