93 



ment of the cell). This conviction led him to consider whether the 

 "genes of the science of heredity" — genes in the original sense — and 

 enzymes could not be regarded as identical.His argument, in short, is 

 that this is really the case, and that by the introduction of this sup- 

 position, new Hght is thrown on the nature and on the action of genes 

 during ontogenesis, and also on the occurrence of fluctuating variabil- 

 ity and of mutations. 



