| → with these breeds as now existing 1859 1860 1861 1866 1869 |
| pigeons 1872 |
|
| → I think, clearly 1859 1860 1861 1866 1869 |
| OMIT 1872 |
|
|
and
→with these breeds as now existing
in Britain, India, and Persia, we
→I think, clearly
trace the stages through which they have insensibly passed, and come to differ so greatly from the rock-pigeon. |
|
| Youatt gives an excellent illustration of the effects of a course of selection, which may be considered as
in so far that the breeders could never have
or even
to
the result which ensued — namely, the production of two distinct strains. The two flocks of Leicester sheep kept by Mr. Buckley and Mr. Burgess, as Mr. Youatt remarks, "have been purely bred from the original stock of Mr. Bakewell for upwards of fifty years. There is not a suspicion existing in the mind of any one at all acquainted with the
that the owner of either of them has deviated in any one instance from the pure blood of Mr. Bakewell's flock, and yet the difference between the sheep possessed by these two gentlemen is so great that they have the appearance of being quite different varieties." |
|
| If there exist savages so barbarous as never to think of the inherited character of the offspring of their domestic animals, yet any one animal particularly useful to them, for any special purpose, would be carefully preserved during famines and other accidents, to which savages are so liable, and such choice animals would thus generally leave more offspring than the inferior ones; so that in this case there would be a kind of unconscious selection going on. We see the value set on animals even by the barbarians of Tierra del Fuego, by their killing and devouring their old women, in times of dearth, as of less value than their dogs. |
|
| In plants the same gradual process of improvement, through the occasional preservation of the best individuals, whether or not sufficiently distinct to be ranked
|
