[Bah-guinda] Dependent on structure and environment) has

Mie Abr 21 16:37:26 CEST 2010

Physical conditions in the district might at times materially modify
it, rendering the race which had been the most capable of supporting
existence under the former conditions
now the least so, and even causing the extinction of the newer and, for
a time, superior race, while the old
or parent species and its first inferior varieties continued to
flourish. Variations in unimportant
parts might also occur, having no perceptible effect
on the life-preserving powers; and the varieties so furnished might run
a course parallel with the parent species, either giving rise
to further variations or returning to the former type. All we argue for
is, that certain varieties have a tendency to maintain their existence
longer than the original species, and this tendency must
make itself felt; for though the doctrine of chances or averages can
never
be trusted to on a limited scale, yet, if applied to high numbers, the
results come nearer to what theory demands, and, as we approach to an
infinity of examples, become strictly accurate. Now the scale on which
nature works is

so vast--the numbers of individuals and the periods of time with which
she deals approach so near to infinity, than any cause, however
slight, and however liable to be veiled and counteracted by accidental
circumstances, must in the end produce its full legitimate results.
_The Partial Reversion of Domesticated Varieties explained._ Let us now
turn
to domesticated animals, and inquire how varieties produced among them
are affected by the principles here enunciated. The
essential difference
in the condition of wild and domestic animals is this,--that among

the former,
their well-being and very existence depend upon the full exercise and
healthy
condition of all their senses and physical powers, whereas, among the
latter, these are only partially exercised, and in some cases are
absolutely unused. A wild animal has to search, and often to labour,
for every mouthful of food--to exercise sight, hearing, and smell in
seeking it, and in avoidi
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