Preface 



additions, for the first time as a whole, so that the reader 

 now has before him the necessary material to form a true 

 estimate of the origin and growth of the theory of Natural 

 Selection, and of the personal relationships of its noble co- 

 discoverers. 



My warmest thanks are oiOfered to Sir Francis Darwin 

 for permission to use his father ^s letters, for his annota- 

 tions, and for rendering help in checking the typescript of 

 the Darwin letters ; to Mr. John Murray, C.V.O., for permis- 

 sion to use letters and notes from the ^^ Life and Letters 

 of Charles Darwin " and from '' More Letters " ; to 

 Messrs. Chapman and Hall for their great generosity in 

 allowing the free use of letters and material in Wallace's 

 ^'My Life''; to Prof. E. B. Poulton, Prof. Sir W. F. 

 Barrett, Sir Wm. Thiselton-Dyer, Dr. Henry Forbes, and 

 others for letters and reminiscences; and to Prof. Poulton 

 for reading the proofs and for valuable suggestions. An 

 intimate chapter on Wallace's Home Life has been con- 

 tributed by his son and daughter, Mr. W. G. Wallace and 



Miss Violet Wallace. 



J. M. 



March, 1916. 



viu 



