53 



the view of producing the two varieties therefrom, the difficulty 

 would be greater, and the time longer. I beUeve, then, that in 

 most species of plants there wiU be found to be forms capable, 

 under the required conditions, of producing individuals to which 

 some may be induced to attach the value of distinct species; and 

 so where a large Hst of species occurs, it is in cases where these 

 variable forms, or rather capabiHties for variation, are most 

 common; and it is in cases where we have a large Ust of reputed 

 species, that experiment is capable of demonstrating the fact, 

 that several so-called species can be produced from a simple 

 form. 



Bradford Abbas, Dorset, July 17th, 1865. 



El 



