376 Darwin, and after Darwin. 
are objections which vitally affect the theory only as 
it has been stated and upheld by Wallace. As the 
theory has been stated and upheld by Darwin, all 
these objections are irrelevant. This is a fact which 
I had not myself perceived at the time when I men- 
tioned these objections in a paper entitled Physzo- 
logical Selection, which was published in 1886. The 
discussions to which that paper gave rise, however, led 
me to consider these matters more closely; and 
further study of Darwin’s writings, with these matters 
specially in view, has led me to see that none of the 
objections in question are relevant to his theory, as 
distinguished from that of Mr. Wallace. This, I 
acknowledge, I ought to have perceived before I 
published the paper just alluded to; but in those 
days I had had no occasion to follow out the dif- 
ferences between Darwin and Wallace to all their 
consequences, and therefore adopted the prevalent 
view that their theories of evolution were virtually 
identical Now, however, I have endeavoured to 
make it clear that the points wherein they differ 
involve the important consequences above set forth. 
All these the most formidable objections against the 
theory of natural selection arise simply and solely 
from what I conceive to be the erroneous manner in 
which the theory has been presented by Darwin’s 
distinguished colleague. 
I have now considered, as impartially as I can, all 
the main criticisms and objections which have been 
brought against the theory of natural selection; and 
the result is to show that, neither singly nor col- 
lectively, are they entitled to much weight. On the 
