CRITICISM 65 



At the same time, the possibihty of some ingenious combina- 

 tion of Loeb's method and Delage's seems to suggest that we 

 should be chary in committing ourselves unreservedly to the 

 conclusion that the heritable organisation is exclusively resident 

 in the chromatin of the nuclei of the germ-cells.* 



* Dr. Hans Driesch has called my attention to some remarkable experi- 

 ments by Dr. Curt Herbst, which seem to show that the nuclear sap as 

 distinguished from the chromosomes may be of importance as a vehicle 

 in inheritance. 



