306 The American Naturatast. [April, 
appear through variation when impressed into cultivation. 
The strawberry is an instance of the evolution of a type of 
lant in less than fifty years, which is so distinct from all 
others that three species have been erected upon it, which was 
uniformly kept distinct from other species by the botanists 
who had occasion to know it best, and which appears to have 
been rarely specifically associated with the species from which 
it sprung. 
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