| → and with P. versicolor 1859 1860 |
| and with P. versicolor, 1861 |
| OMIT 1866 1869 1872 |
|
| ↑ 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.
|
|
| → fertile. 1859 1860 1861 |
| or perfectly fertile. 1866 1869 1872 |
|
|
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.
→and with P. versicolor
are 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 less than
hybrids (grandchildren of the pure geese) from one nest. In India, however, these cross-bred geese must be far more fertile; for I am assured by two eminently capable judges, namely Mr. Blyth and Capt. Hutton, that whole flocks of these crossed geese are kept in various parts of the country; and as they are kept for profit, where neither pure parent-species exists, they must certainly be highly
→fertile.
|
| A doctrine which originated with
has been
|
