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 



1. ^mrnn^ 2,. x$"M^ o. 



9. 



FIG. 149 



next day developed into the characteristic blastulse some of 

 which are represented in Fig. 149. Some of these blastulse 

 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 blastulaB 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 



