SOME EXPERIMENTS ON CELL-DIVISION. 



273 



middle of the spindle. In the lower left blastomcres the spindle does not 

 lie parallel to the surface. Yet the cleavage furrow was formed just 

 about the middle of the spindle. In Ihe upper left blastomcre one of the 



Fig. 21. Egg compressed at the four-cell stage. Fig. 22. Egg compressed. Fig. 23. 

 The same drawn a Ii itle later. Fig. 24. Egg compressed dividing by one-sided constriction. 

 Fig. 25. Egg compressed dividing by one-sided constriction. Fig. 26. Egg in which one of 

 the asters h.is detached from the spindle at the anaphase, drawn at the telophase. All the draw- 

 ings X ige. 



asters has separated from the chromosomes. Despite this the indentation 

 has began to cut in perdendicular to the middle of the spindle. 



Case K In a more strongly compressed egg (Figs. 22, 23) I have 

 seen an interesting case of cleavage. In three spindles the cleavage 



