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 Theorte 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 
