42개의 결과 중 1 - 5개
Distinction betwecn,tho sterility of first crosses and of hybrids— Sterility various in
degree, not universal, affected by close interbreeding, removed by domestication
— Laws governing tho sterility of hybrids— Sterility not a special endowment, ...
lug— Fertility of varieties when crossed and of their mongrel offspring not uni
versal— Hybrids and mongrels compared independently of their fertility—
Summary ,217 CHAPTER IX. OK THE IMPERFECTION 07 THE GEOLOGICAL
Many exotic plants have pollen utterly worthless, in the same exact condition as
in the most sterile hybrids. When, on the one hand, we see domesticated animals
and plants, though often weak and sickly, yet breeding quite freely under ...
Lastly, the hybrids or mongrels from between all the domestic breeds of pigeons
are perfectly fertile. I can state this from my own observations, purposely made on
the most distinct breeds. Now, it is difficult, perhaps impossible, to bring forward ...
In plants which are temporarily propagated by cuttings, buds, &c, the importance
of the crossing both of distinct species and of varieties is immense ; for the
cultivator here quite disregards the extreme variability both of hybrids and
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