LUTHER BURBANK 



In another connection we shall have occasion 

 to deal more at length with the processes of 

 natural selection; and we shall see numberless 

 examples before we are through of the way in 

 which artificial selection is instrumental in 

 developing new races of plants. 



Foundations of Natural Selection 



But for the moment I will consider a little 

 more at length the question of the origin of the 

 variation which resulted in giving this particular 

 calla a perfume that was not normal to its race. 

 In so doing, we shall gain a clue to the genesis of 

 other types of variation or mutation through which 

 various and sundry new races of cultivated plants 

 have originated, and through which also, we have 

 every reason to believe, numberless species of 

 animals and plants in a state of nature have been 

 evolved. 



The presentation of this subject puts us in 

 touch with one of the newest and doubtless one 

 of the most important aspects of the problem of 

 evolution. 



Since Darwin we have fully understood that 

 all evolution of organic forms must have its origin 

 in variations. No two individuals even of the same 

 species are precisely alike, and it is not at all 

 unusual to find individuals of a species showing 

 very considerable differences, even as regards the 



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