5 

 interstices between the c^ns, ah alon 

 in ali the sections ceils are being cut out 



An especially interesting case of this 

 is found in the v - . . . cells show mitotic fig- 



ures, and in o si .e nuclei small solidly 



staining round - "'net ion. 



derived . i . is a fine . of its 



-at ion cavity is v 

 ectly fr and 



Low U of cells cut out of 



it and at the left a nucleus under I inal ceil and 



clearly derived frcmit, ' .• the center, the 



periblast is re Lne. This ich 



f '98, . rout. 



- I hired- fifty- six Surface Culls. 

 The normal type blastoderm of this s i 



• >,b « e cells iyi n upper suj consider' 



k /or parts nearer t. e peri- 

 To right and left are furrows -'. 

 ing to cut cells out o 

 cells nearly free from it . 



