Alfred Russel Wallace 



variation " and '' mutation '' men, by so continually say- 

 ing " if they vary " — '^ without variation Natural Selection 

 can do nothing," etc. 



Your argument that variations are not caused by change 

 of environment is equally forcible and convincing. Has 

 anybody answered de Vries yet ? 



F. Darwin lent me Prof. Hubrecht's review from the 

 Popular Science Monthly, in which he claims that de Vries 

 has proved that new species have always been produced 

 from " mutations/' never through normal variability, and 

 that Darwin latterly agreed with him ! This is to me 

 amazing! The Americans too accept de Vries as a second 

 Darwin !— Yours very sincerely, Alfred R. Wallace. 



Sir J. Hooker to A. R. Wallace 



The Camp, Sunningdale. November 12, 1905. 



My dear Wallace, — My return from a short holiday at 

 Sidmouth last Thursday was greeted by your kind and wel- 

 come letter and copy of your ^' Life." The latter was, I 

 assure you, never expected, knowing as I do the demand 

 for free copies that such a work inflicts on the writer. In 

 fact I had put it down as one of the annual Christmas gifts 

 of books that I receive from my own family. Coming, as 

 it thus did, quite unexpectedly, it is doubly welcome, 

 and I do heartily thank you for this proof of your greatly 

 valued friendship. It will prove to be one of four works 

 of greatest interest to me of any published since Darwin's 

 *' Origin," the others being Waddell's " Lhasa," Scott's 

 " Antarctic Voyage," and Mill's " Siege of the South 

 Pole." 



I have not seen Clodd's edition of Bates's *' Amazon,'* 

 which I have put down as to be got, and I had no idea 

 that I should have appeared in it. Your citation of my 

 letters and their contents are like dreams to me; but to 



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