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or wild dog 1859 1860 1861 1866 1869
OMIT 1872

living free 1859 1860 1861 1866
for they live 1869 1872

I am inclined to look at 1859 1860 1861 1866
OMIT 1869 1872

as 1859 1860 1861 1866
may be looked at as 1869 1872

as that former species 1859 1860 1861 1866
OMIT 1869 1872

were capable of enduring 1859 1860 1861 1866
having formerly endured 1869 1872

fertile (a far severer test) under them, may be used as an argument that a large proportion of other
animals
animals,
now in a state of
nature
nature,
could easily be brought to bear widely different climates. We must not, however, push the foregoing argument too far, on account of the probable origin of some of our domestic animals from several wild
stocks;
stocks:
the blood, for instance, of a tropical and arctic wolf or wild dog may perhaps be mingled in our domestic breeds. The rat and mouse cannot be considered as domestic animals, but they have been transported by man to many parts of the world, and now have a far wider range than any other
rodent;
rodent,
living free under the cold climate of Faroe in the north and of the Falklands in the south, and on many
an island
islands
in the torrid zones. Hence I am inclined to look at adaptation to any special climate as a quality readily grafted on an innate wide flexibility of constitution,
which is
which is
common to most animals. On this view, the capacity of enduring the most different climates by man himself and by his domestic animals, and
the
such
fact
facts
as that former species of the
extinct elephant
elephant
and rhinoceros were capable of enduring a glacial climate, whereas the living species are now all tropical or sub-tropical in their habits, ought not to be looked at as anomalies, but
merely
merely
as examples of a very common flexibility of constitution, brought, under peculiar circumstances, into
action.
play.
How much of the acclimatisation of species to any peculiar climate is due to mere habit, and how much to the natural selection of varieties having different innate constitutions, and how much to both means combined, is
an
a very
obscure question. That habit or custom has some
influence,
influence
I must believe, both from
analogy
analogy,
and from the incessant advice given in agricultural works, even in the ancient Encyclopædias of China, to be very
cautious
cau- tious