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
It has already been shown, while setting forth in the preceding chapter
the antecedent standing of the issue, that in this respect the _prima
facie_ presumption is wholly on the side of the transmission, in greater
degree or less, of acquired characters. Even Weismann allows that all
"_appearances_" point in this direction, while there is no inductive
evidence of the action of natural selection in any one case, either as
regards germs or somas, and therefore, _a fortiori_, of the
"all-sufficiency" of this cause[35]. It is true that in some of his
earlier essays he has argued that there is no small weight of _prima
facie_ evidence in favour of his own views as to the non-inheritance of
acquired characters. This, however, will have to be considered in its
proper place further on. Meanwhile I shall say merely in general terms
that it arises almost entirely from a confusion of the doctrine of
Continuity as absolute with that of Continuity as partial, and
therefore, as admitting of degrees in different cases--which, as already
explained, are doctrines wide as the poles asunder. But, leaving aside
for the present such _prima facie_ evidence as Weismann has adduced on
his side of the issue, I may quote him as a hostile witness to the
weight of this kind of evidence _per contra_, in so far as it has
already been presented in the foregoing chapter. Indeed, Weismann is
much too logical a thinker not to perceive the cogency of the
"appearances" which lie against his view of Continuity as
absolute--although he has not been sufficiently careful in
distinguishing between such Continuity and that which admits of degrees.
[35] See, especially, his excellent remarks on this point, _Contemp.
Rev._ Sept. 1893.
We may take it, then, as agreed on all hands that whatever weight merely
_prima facie_ evidence may in this matter be entitled to, is on the side
of what I have termed moderated Lamarckianism: first sight "appearances"
are against the Neo-Darwinian doctrine of the absolute non-inheritance
of acquired characters.
* * * * *
Let us now turn to another and much more important line of indirect
evidence in favour of moderated Lamarckianism.
Public-domain text, read in full here on John Shaqi.
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