201+ 



BEHAVIOR OF ISOLATED CELLS 



Fig. 1. Isolated amp)ilbian gastrula cell. 



Fig. 2. Ectoplasmic movements in isolated KmDryoiiic Cell. 



Rotating movements in the absence of (Fig. 3), and 

 in the presence of endoplasmic sol-gel formation 

 (Fig. 4) . 



Fig. 5. Fission of a cell Into unequal halves. 



Fig. 6. Unfertilized frog egg budding off spherical frag- 

 ments. 



Holtfreter, I9U6: Jour. Morphology. 79:27. 



