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 
FIG. 149 
next day developed into the characteristic blastules some of 
which are represented in Fig. 149. Some of these blastule 
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 blastule 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 blastule the outline 
Digitized by Microsoft® 
