| → other 1859 1860 1861 1866 1869 |
| distinct species of 1872 |
|
| → OMIT 1866 1869 1872 |
| and with P. versicolor 1859 1860 |
| and with P. versicolor, 1861 |
|
| ↑ 1 blocks not present in 1859 1860 1861 1866 1869; present in 1872 |
| M. Quatrefages states that the hybrids from two moths (Bombyx cynthia and arrindia) were proved in Paris to be fertile
inter
se
for eight generations.
|
|
| → From the experiments lately made on a large scale in France, it seems that two such distinct species as the hare and rabbit, when they can be got to breed together, produce offspring almost perfectly fertile. 1866 |
| There is no doubt that these three pheasants, namely, the common, the true ring-necked, and the Japan, intercross, and are becoming blended together in the woods of several parts of England. 1860 1861 |
|
|
has been crossed with nine
→other
finches,
as not one of these
breeds freely in confinement, we have no right to expect that the first crosses
them and the canary, or that their hybrids, should be perfectly fertile. Again, with respect to the fertility in successive generations of the more fertile hybrid animals, I hardly know of an instance in which two families of the same hybrid have been raised at the same time from different parents, so as to avoid the ill effects of close interbreeding. On the contrary, brothers and sisters have usually been crossed in each successive generation, in opposition to the constantly repeated admonition of every breeder. And in this case, it is not at all surprising that the inherent sterility in the hybrids should have gone on increasing. If we were to act thus, and pair brothers and sisters in the case of any pure animal, which from any cause had the least tendency to sterility, the breed would assuredly be lost in a
few generations. |
|
| Although I
know of
thoroughly well-authenticated cases of perfectly fertile hybrid animals, I have
reason to believe that the hybrids from Cervulus vaginalis and Reevesii, and from Phasianus colchicus with P.
→OMIT
are perfectly fertile. ↑ →From the experiments lately made on a large scale in France, it seems that two such distinct species as the hare and rabbit, when they can be got to breed together, produce offspring almost perfectly fertile.
The hybrids from the common and Chinese geese (A.
species which are so different that they are generally ranked in distinct genera, have often bred in this country with either pure parent, and in one single instance they have bred
inter This was effected by Mr. Eyton, who raised two hybrids from the same
but from different hatches; and from these two birds he raised no
|
