RADIATION AND FERTILIZING POWER. 



477 



suspensions, | 10 per cent., | 12 per cent. (Curve 5), 14 per cent., 

 the increase in rate is noticeable only up to one hour, f , and j 

 hours respectively. With still greater dilution, 15 per cent. 



root 



10 



3 hrs 



FIG. i. The effect of radiation on the fertilizing power of sperm. Time and 

 dilution are factors. The more dilute suspensions are more susceptible, particularly 

 immediately after radiation. A, B, C normal nonradiated sperm, a, b, c 

 radiated sperm in corresponding dilutions. A, a 5*%; B, b ^ 12 %; C, c 5"% 

 sperm dilutions. Ordinates represent the percentage of eggs cleaved. Abscissae 

 represent the time in hours, since the beginning of the exposure of sperm to radi- 

 ation. 



