Darwin, and After Darwin, Volume 2 of 3: Post-Darwinian Questions: Heredity and UtilityRomanes, George John
Science
Darwin, and After Darwin, Volume 2 of 3: Post-Darwinian Questions: Heredity and Utility
Romanes, George John
Evolution (Biology); Heredity
Moreover, any such meaning is out of accordance with the context from
which the passage is taken. For, after a long consideration of the
question of utility, Darwin sums up,--"We thus see that with plants many
morphological changes may be attributed to the laws of growth and the
interaction of parts, _independently of natural selection_." And then he
adds,--"From the fact of the above characters being _unimportant for the
welfare of the species_, any slight variations which occurred in them
_would not have been augmented through natural selection_." Again, still
within the same passage, he says, while alluding to the causes other
than natural selection which lead to changes of specific
characters,--"If the _unknown cause_ were to act almost uniformly for a
length of time, we may infer that the result would be almost uniform;
and in this case _all_ the individuals of the _species_ would be
modified in the same manner." For my own part I do not understand how
Mr. Wallace can have overlooked these various references to _species_,
all of which occur on the very page from which he is quoting. The whole
argument is to show that "many morphological changes may be attributed
to the laws of growth and the inter-action of parts [_plus_ external
conditions of life], independently of natural selection"; that such
non-adaptive changes, when they occur as "specific characters," may, if
the species should afterwards give rise to genera, families, &c., become
distinctive of these higher divisions. But there is nothing here, or in
any other part of Darwin's writings, to countenance the inconsistent
notion which Mr. Wallace appears to entertain,--viz. that species which
present useless characters are more apt to give rise to genera,
families, &c., than are species which do not present such characters.
The next passage which Mr. Wallace quotes, with his comments thereon, is
as follows. The italics are his.
Public-domain text, read in full here on John Shaqi.
Reviews
Reviews
No reviews yet
Be the first to share your thoughts on this work.
Elsewhere in the archive
Join the Discussion
Join the discussion
Sign in to leave a comment or review.
Sign InorCreate an account