Earlier Theories of Heredity 15 



together with their descendants. Hence the theory 

 is called intracellular pangenesis, as contrasted with 

 Darwin's body pangenesis, that is, distribution of the 

 heredity particles in the cell as contrasted with distri- 

 bution through the body as a whole. 



De Vries formulated this theory before he had 

 conducted the breeding experiments that led to his 

 theory of mutation, and afterward he applied the theory 

 to his experimental results in breeding. 



1. Darwin, Charles, The variation of animals and plants under 

 domestication. London. 1890. 



2. De Vries, Hugo, Intracellular pangenesis. Chicago. 1910. 



3. PouLTON, Shonland, Shipley, Weisuann, on heredity. 

 Clarendon Press. 1891. 



