after (a), (d) Fixation after 35 minutes and stained in Giesma. The two nuclei 

 are joined by a bridge. 



jVo. 27 Effect on a chick osteoblast of o- 13 molar chloracetophenone added to 

 culture as anaphase began, (a) Within | minute of addition of C.\P. Anaphase 

 movement has already ceased, (b) 5 minutes later than (a). Blebs appear at 

 cell surface. (C) 5^ minutes later than (o). (d) Fixation after 24 minutes. The 

 cell now consists of strands connecting blebs of protoplasm not all of which 

 are shown. In one of these are the unchanged daughter chromosomes. 



