NEO-MENDELISM IN PLANTS 427 
variation within the species. Darwin depended upon it as the basis of 
his theory of natural selection as the origin of species; in fact, ever 
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Intermediate Grades 
Fic. 86.—Diagram illustrating Nilsson-Ehle’s 63:1 ratio. (From Coulter 
and Coulter.) 
since Darwin’s Origin of Species, individual variation has been funda- 
mental in our conceptions. To account for this universally recog- 
nized phenomenon, Darwin proposed his transportation hypothesis as 
