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<p>the efficiency of numerous powers, the increase of any one by the natural selection of a variation is necessarily difficult. Here it is. </p>
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<p>“Finally, as indefinite and almost illimitable variability is the usual result of domestication and cultivation, with the same part or organ
varying in different individuals in different or even in directly opposite ways; and as the same variation, if strongly pronounced, usually recurs
only after long intervals of time, any particular variation would generally be lost by crossing, reversion, and the accidental destruction of the </p>
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<p align="right">varying individuals, unless carefully preserved by man.”—Vol. ii, 292. Remembering that mankind, subject as they are to this domestication and
cultivation, are not, like domesticated animals, under an agency which picks out and preserves particular variations; it results that there must
usually be among them, under the influence of natural selection alone, a continual disappearance of any useful variations of particular faculties
which may arise. Only in cases of variations which are specially preservative, as for example, great cunning during a relatively barbarous
state, can we expect increase from natural selection<i>alone. We cannot suppose that minor traits, exemplified among others by the</i>æsthetic
perceptions, can have been evolved by natural selection. But if there is inheritance of functionally-produced modifications of structure, evolution </p>
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<p align="center">of such minor traits is no longer inexplicable. Two remarks made by Mr. Darwin have implications from which the same general conclusion must, I think, be drawn. Speaking of the variability of </p>
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<p align="center">animals and plants under domestication, he says:— “Changes of any kind in the conditions of life, even extremely slight changes, often suffice to cause variability...Animals and plants continue
to be variable for an immense period after their first domestication;... In the course of time they can be habituated to certain changes, so as to
become less variable;...There is good evidence that the power of changed conditions accumulates; so that two, three, or more generations must be
exposed to new conditions before any effect is visible.... Some variations are induced by the direct action of the surrounding conditions on the whole
organization, or on certain parts alone, and other variations are induced indirectly through the reproductive system being affected in the same
manner as is so common with organic beings when removed<U>from their natural conditions.”—(Animals and Plants under</U>Domestication, vol. ii, 270.) </p>
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<p align="left" style="font: 14px;">There are to be recognized two modes of this effect produced by changed conditions on the reproductive system, and consequently on offspring.
Simple<B>arrest of development is one. But beyond the variations of offspring arising from imperfectly</B>developed reproductive systems in
parents—variations which must be ordinarily in the nature of imperfections—there are others due to a changed balance of functions caused
by changed conditions. the fact noted by mr. darwin in the above phiage, “that the power of changed conditions accumulates; so that two, three, or
more generations must be exposed to new conditions before any effect is visible,” implies that during these generations there is going on some
change of constitution consequent on<u>the changed proportions and relations of the functions. I will not dwell on</u>the implication, which seems
tolerably clear, that this change must consist of such modifications of organs as adapt them to their changed functions; and that if the influence .</p>
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