610 



STUDIES IN GENERAL PHYSIOLOGY 



tendency to segment in normal sea-water. It may be pos- 

 sible that these variations enhance or diminish the effects of 

 artificial solutions upon the development of unfertilized eggs. 

 The eggs that had been for two hours in solution 1 had the 



5. 



9. 



FIG. 149 



next day developed into the characteristic blastulas some of 

 which are represented in Fig. 149. Some of these blastul* 

 originated possibly from the whole mass of one egg, for 

 instance 1, 3, and 4. But even here the irregular outline 

 betrays clearly that the blastulse originated from eggs with- 

 out a membrane. As I said in an earlier experiment, the 

 outlines of the eggs became irregular through the amoeboid 

 motions of the blastomeres, and in the blastulse the outline 



