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Principles of Selection anciently followed, and their Effects. 1866 1869
Selection . — 1859 1860
Selection.1861
Principles of Selection anciently followed , and their Effects. 1872

and definite action 1869 1872
action 1859 1860 1861 1866

Principles of Selection anciently followed, and their Effects.
Let us now briefly consider the steps by which domestic races have been produced, either from one or from several allied species. Some
little
....
effect
may,
may
perhaps,
....
be attributed to the direct and definite action of the external conditions of life, and some
little
little
to habit; but he would be a bold man who would account by such agencies for the differences
of
between
a dray and race horse, a greyhound and
blood-hound,
bloodhound,
a carrier and tumbler pigeon. One of the most remarkable features in our domesticated races is that we see in them adaptation, not indeed to the animal's or plant's own good, but to
man's
mans
use or fancy. Some variations useful to him have probably arisen suddenly, or by one step; many botanists, for instance, believe that the
fuller's
fullers
teazle,
teasel,
with its hooks, which cannot be rivalled by any mechanical contrivance, is only a variety of the wild Dipsacus; and this amount of change may have suddenly arisen in a seedling. So it has probably been with the turnspit dog; and this is known to have been the case with the ancon sheep. But when we compare the dray-horse and race-horse, the dromedary and camel, the various breeds of sheep fitted either for cultivated land or mountain pasture, with the wool of one breed good for one purpose, and that of another breed for another purpose; when we compare the many breeds of dogs, each good for man in
very
very
different ways; when we compare the game-cock, so pertinacious in battle, with other breeds so little
quarrel-some,
quarrelsome,
with "everlasting layers" which never desire to sit, and with the bantam so small and elegant; when we compare the host of agricultural, culinary, orchard, and flower-garden races of plants, most useful to man at different seasons and