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290 OBITUARY x 
indifferent, but which are just as strongly heredi- 
tary as the advantageous variations. The advan- 
tageous structure is but one product of a modified 
general constitution which may manifest itself by 
several other products; and the selective process 
carries the general constitution along with the 
advantageous special peculiarity. A given species 
of plant may owe its existence to the selective 
adaptation of its flowers to insect fertilisers ; but the’ 
character of its leaves may be the result of varia- 
tions of an indifferent character. It is the origin” 
of variations of this kind to which Darwin refers in 
his frequent reference to what he calls “laws of 
correlation of growth ” or “ correlated variation.” 
These considerations lead us further to see the 
inappropriateness of the objections raised : 
Darwin’s theory on the ground that natural 
selection does not account for the first commence- 
ments of useful organs. But it does not pretend 
to do so. The source of such commencements is 
necessarily to be sought in different variations, 
which remain unaffected by selection until they 
have taken such a form as to become utilisable in 
the struggle for existence. 
It is not essential to Darwin’s theory tha 
anything more should be assumed than the fa 
of heredity, variation, and unlimited multiplication 
and the validity of the deductive reasoning as 6 
the effect of the last (that is, of the struggle f » 
existence which it involves) upon the varie 
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