MARIE A. HINRICHS. 



expression of the agglutinating power in terms of " agglutinating 

 units." This is the method used by Lillie in determining the ag- 

 glutinating strength of a given sample of egg-water (F. R. Lillie 

 and E. E. Just, '24, p. 487). A summary of a number of such 

 experiments appears in Table I. 



It will be seen that the rate of fertilizin production is at first 

 increased, then decreased. In 3 experiments, the increase came 

 with exposures of I minute or less. In the other two experi- 

 ments, all exposures exceeded 5 min., and in one case the maxi- 

 mum increase came at 10 min. Successive tests for agglutinating 

 power showed a rapid decrease in rate of fertilizin production, 

 both in radiated and in non-radiated lots of eggs. 



Samples of eggs fertilized with normal sperm at the time of 

 testing for agglutinating power indicate a falling off in fertilizabil- 

 ity and general viability running parallel to the decrease in rate of 

 fertilizin production. 



TABLE II. 

 FERTILIZABILITY OF RADIATED EGGS. 



A. U. Agglutinating units. 



The percentage of normal development is reduced by radiation 

 (Hinrichs, '266), and also by a delay in fertilization (F. R. Lillie, 



