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During the earlier period, when Darwin was only discovered those
numerous cases, the explanation of which was given to his hypothesis, sometimes
however, he had the opportunity to see how shaky was
the explanations given for these numerous cases the hypothesis
recognized by his grandfather and Lamarck; of course, that Darwin was wholly
imbued with the conviction that a hypothesis is completely satisfactory, and
the other is not tenable. But in the mind of man, so sincere and
so affordable for any kind of evidence, what was Darwin
naturally there was a reaction. The devolution functional
resulting modifications though (as you can tell by the above quotes,
regarding beliefs called earlier researchers) apparently,
one time and rejected, but for all that such transfer has always been recognized
to a certain extent, but then it began to admit more and more and
the end is perfectly reasonable were numbered among the factors that are important
value.
Having dealt with that by turning in the views, which surfaced in the last
the writings of Darwin, we allow ourselves to ask the question: should we not go
next? Is it possible to recognize sufficient that interest in organic
the evolution of what Darwin eventually attributed to the transfer of modifications,
produced by use and disuse? Discussing a number of evidence
we were talking above, I believe, will be allowed to think that
named share must be much larger than allowed
Darwin even recently.
In the above passage by Darwin acknowledged, "that
the impact of the amended conditions is accumulated; so that two, three or more generations
needs to be under the influence of new conditions before it becomes noticeable
any effect". Here itself implies that during these generations
committed some changes in the structure corresponding to the changed
ratios of functions. I do not consider it necessary to dwell on figuring out
what is clear enough in itself, namely, that these changes should consist of
in such modifications of organs prisposobili them to changed
functions, and that if the effect of changing conditions can "accumulate", then
only when the assumption of hereditary transmission of such modifications. Exactly
so I do not propose to dwell on the questions: what is the nature of
the effect on state reproductive elements, and which
manifested in the form of modifications? Whether this effect is entirely attributed to
the emerging needs of the species? Whether this effect is such that
makes the species less adapted to the new requirements? Or
thanks to him, the variety adapts better to the new requirements? Not
reflecting on these issues is sufficient to indicate the need
the assumption that changing functions of the organs - in one form or another, but
anyway - reflected in the form of changed habits
reproductive elements. In view of the foregoing, it is impossible not
agree that the change of departure body produces hereditary
the effect, whatever the nature of the latter.
The second of the two notes of Darwin, mentioned above, contains
in those parts of his writings, which speak of the correlative
changes. In the essay "the Origin of species" he says:
"The whole organization is such a close connection during your growth
and development that will occur if a slight change in any one part,
which will increase due to natural selection, other parts too
is modified".
In the appropriate place in the essay "Animals and Plants under
Domestication" (Vol. II, 320), Darwin says:
"Correlative changes are for us a matter of great importance.
For if one part of the body undergoes change as a result
long lasting selection, which takes place with participation whether human or only
nature, and other parts of the organization are also subjected to the inevitable
changes Of this ratio, obviously, is that natural
varieties, like our domesticated animals and plants, or very
rarely or never differ from each other only in any one
the only sign".
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