On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeThis is the 'second edition' of Darwin's Origin of Species. |
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Page 245
HyBRIDISM, Distinction between the sterility of first crosses and of hybrids—
Sterility various in degree, not universal, affected by close interbreeding,
removed by domestication—Laws governing the sterility of hybrids–Sterility not a
special ...
HyBRIDISM, Distinction between the sterility of first crosses and of hybrids—
Sterility various in degree, not universal, affected by close interbreeding,
removed by domestication—Laws governing the sterility of hybrids–Sterility not a
special ...
Page 246
when first crossed, and the sterility of the hybrids produced from them. Pure
species have of course their organs of reproduction in a perfect condition, yet
when intercrossed they produce either few or no offspring. Hybrids, on the other
hand, ...
when first crossed, and the sterility of the hybrids produced from them. Pure
species have of course their organs of reproduction in a perfect condition, yet
when intercrossed they produce either few or no offspring. Hybrids, on the other
hand, ...
Page 247
But in these and in many other cases, Gärtner is obliged carefully to count the
seeds, in order to show that there is any degree of sterility. He always compares
the maximum number of seeds produced by two species when crossed and by
their ...
But in these and in many other cases, Gärtner is obliged carefully to count the
seeds, in order to show that there is any degree of sterility. He always compares
the maximum number of seeds produced by two species when crossed and by
their ...
Page 248
It is certain, on the one hand, that the sterility of various species when crossed is
so different in degree and graduates away so insensibly, and, on the other hand,
that the fertility of pure species is so easily affected by various circumstances, ...
It is certain, on the one hand, that the sterility of various species when crossed is
so different in degree and graduates away so insensibly, and, on the other hand,
that the fertility of pure species is so easily affected by various circumstances, ...
Page 249
Now let us turn to the results arrived at by the third most experienced hybridiser,
namely, the Hon. and Rev. W. Herbert. He is as emphatic in his conclusion. M 3
CHAP. VIII. STERILITY. 249 that close interbreeding lessens fertility, and, on the ..
.
Now let us turn to the results arrived at by the third most experienced hybridiser,
namely, the Hon. and Rev. W. Herbert. He is as emphatic in his conclusion. M 3
CHAP. VIII. STERILITY. 249 that close interbreeding lessens fertility, and, on the ..
.
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action adapted allied America amount ancient animals appear become believe birds breeds cause chapter characters climate closely common compared considered continuous crossed descended developed difficulty distinct domestic doubt Edition effects existing extinct extremely facts families favourable fertility flowers follow formations forms genera genus geological give given groups habits hand Hence History hybrids important increase individuals inhabitants inherited insects instance instincts intermediate islands kind land laws less living look male manner means modification namely natural selection naturalists nearly never observed occur organic origin parent perfect period plants points Post 8vo present principle probably produced range ranked reason remarked Second seeds seems seen separated single slight sometimes species sterility structure struggle successive supposed tend theory tion variability variations varieties vary Vols whole widely Woodcuts
Bibliographic information
| Title | On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for Life |
| Author | Charles Darwin |
| Edition | 5 |
| Publisher | J. Murray, 1860 |
| Length | 502 pages |
| Export Citation | BiBTeX EndNote RefMan |