The Making of Species 



pin their faith to this, needlessly increase the 

 difficulty of the problem which they have to 

 face. 



There remains the third school, to which we 

 belong, and of which Bateson, De Vries, Kellog 

 and T. H. Morgan appear to be adherents. This 

 school steers a course between the Scylla of use- 

 inheritance and the Charybdis of the all-sufficiency 

 of natural selection. It may seem surprising to 

 some that we should class De Vries as a Neo- 

 Darwinian, seeing that he is the originator of the 

 theory of evolution by means of mutations, which 

 we shall discuss in Chapter III. of this work. 

 As a matter of fact the theory of mutations should 

 be regarded, not as opposed to the theory of 

 Darwin, but as a theory engrafted upon it. De 

 Vries himself writes : " My work claims to be in 

 full accord with the principles laid down by 

 Darwin." Similarly Hubrecht writes in the 

 Contemporary Review for November 1908 : 

 " Paradoxical as it may sound, I am willing to 

 show that my colleague, Hugo de Vries, of 

 Amsterdam, who a few years ago grafted his 

 Mutations Theorie on the thriving and very 

 healthy plant of Darwinism, is a much more 

 staunch Darwinian than either Dr Wallace him- 

 self, or the two great authorities in biological 

 science whom he mentions, Sir William 

 Thistleton Dyer and Professor Poulton." 



Having classified ourselves, it remains for us 



26 



