342 
power of impressing its own likeness upon its offspring as 
some variants have. If this view can be sustained, then 
either the principle of correlated variation asserts itself in 
the first generation or after a few generations ; or it is 
mastered by the power of the individual to impress its 
own likeness on offspring ; but in neither of these cases 
has Natural Selection anything to do with the matter. 
In other cases Mr. Darwin asserts that, where there is an 
appearance of correlation, the true explanation is to be 
found in the sole action of Natural Selection. 
“ Some other correlations are apparently due to the manner in 
which Natural Selection can alone act. For instance, Alph. de 
Candolle has remarked that winged seeds are never found in fruits 
which do not open. I should explain this rule by the impossibility 
of seeds gradually becoming winged through Natural Selection, 
unless the capsules were open ; for in this case alone could the 
seeds, which were a little better adapted to be wafted by the wind, 
gain an advantage over others less well-fitted for wide dispersal.”— 
{Origin of Species, p. ny.) 
“We may often falsely attribute to correlated variation, structures 
which are common to whole groups of species, and which in truth 
are simply due to inheritance ; for an ancient progenitor may have 
acquired through Natural Selection some one modification in struc 
ture, and, after thousands of generations, some other and independent 
modification ; and these two modifications, having been transmitted 
to a whole group of descendants with diverse habits, would naturally 
be thought to be in some necessary manner correlated.”—(Origin 
of Species, pp. 116-7.) 
“ Bronn also insists that distinct species never differ from each 
other in single characters, but in many parts, and he asks how it 
always comes that many parts of the organisation should have been 
modified at the same time through variation and Natural Selection. 
But there is no necessity for supposing that all the parts of any 
being have been simnltaiieously modified. The most striking modi 
fications excellently adapted for some purpose might, as was formerly 
remarked, be acquired by successive variations, if slight, first in 
one part and then in another; and as they would be transmitted all 
together, they would appear to us as if they had been simultaneously 
developed.”—(Origin of Species, pp. i6g-iyo.)