SEX REVERSALS 



TABLE III 



271 



Sex Eatios in Different Local Eaces of the Grass Frog Shortly 



AFTER Metamorphosis (at most two months) 



Those with asterisk were caught in the open. 



The chromosome composition of frogs has been in dis- 

 pute for several years, not only as to the number of chro- 

 mosomes present, but as to whether the male or the female 

 is digametic. The most probable number of chromosomes 

 for several species seems to be 26 (n=13). Other num- 



