1 68 



PROBLEMS OF FERTILIZATION 



hypothesis and has therefore confirmed the writer's 

 opinion that this is the activable substance of the egg. 



The same author (Moore, 191 7) has also examined 

 Loeb's statement concerning the fertilizabihty of eggs 

 treated by hypertonic sea-water with results concordant 



10 O »') o 



M CO Tt \0 



100 



90 

 80 

 70 

 60 



50 

 40 

 30 

 20 

 10 



1 00" 



90 

 80 

 70 

 60 



so 



■^OtoOvoO'oO loO loOvoO 10 O 





a 



o 



CO 

 fO 



>o 



O lO 



CO CO 



O 



CO 



>o 

 O 





o 



VO 



O 

 10 



10 



00 



o 

 o 



to ^O 



Fig. 19. — Curve of fertilization superimposed upon butyric add 

 treatment in Arbacia. Curve b continues curve a. The ordinates 

 represent percentages of fertilization as measured by cleavage and the 

 abscissae length of previous exposure to butyric acid in seconds (after 

 C. R. Moore). 



