Early Development of the Hen's Egg. 



131 



23 



Fig. 23. — A tbirty-four-celled stage, drawn from a whole mount preparation. 

 The egg was taken from the shell-gland. There are seventeen marginal and 

 seventeen central cells. At the posterior margin are shown two of the short 

 radial furrows which were noted in Fig. 20. X IS. 



B 



; >• ;;.-;;;:-;\:;;;^:;i;>**' 



c 



n 



24 



Fig. 24. — A. Median section of a blastoderm showing thirty-two cells. B. 

 A section taken seven sections to the left of the preceding, n, nucleus; c, 

 cell showing a connection with the floor of the segmentation cavity (see text 

 for a description of these figures) . Both X 59. 



