On the Origin of Species by Means of Natural SelectionJohn Murray, 1860 - 502 páginas |
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Página 5
... plants - Nature of the checks to increase - Competition universal - Effects of climate - Protection from the num- ber of individuals - Complex relations of all animals and plants throughout nature -Struggle for life most severe between ...
... plants - Nature of the checks to increase - Competition universal - Effects of climate - Protection from the num- ber of individuals - Complex relations of all animals and plants throughout nature -Struggle for life most severe between ...
Página 11
... plant itself . It is , therefore , of the highest importance to gain a clear insight into the means of modification ... plants would offer the best chance . of making out this obscure problem . Nor have I been disappointed ; in this and ...
... plant itself . It is , therefore , of the highest importance to gain a clear insight into the means of modification ... plants would offer the best chance . of making out this obscure problem . Nor have I been disappointed ; in this and ...
Página 14
... plants and animals , one of the first points which strikes us , is , that they gen- erally differ much more from each other , than do the in- dividuals of any one species or variety in a state of nature . When we reflect on the vast ...
... plants and animals , one of the first points which strikes us , is , that they gen- erally differ much more from each other , than do the in- dividuals of any one species or variety in a state of nature . When we reflect on the vast ...
Página 15
... plants display the utmost vigour , and yet rarely or never seed ! In some few such cases it has been found out that ... plants have pollen utterly worthless , in the same exact condition as in the most sterile hybrids . When , on the one ...
... plants display the utmost vigour , and yet rarely or never seed ! In some few such cases it has been found out that ... plants have pollen utterly worthless , in the same exact condition as in the most sterile hybrids . When , on the one ...
Página 16
... plants withstand domestication or cultivation , and vary very slightly - perhaps hardly more than in a state of nature . A long list could easily be given of " sporting plants ; " by this term gardeners mean a single bud or offset ...
... plants withstand domestication or cultivation , and vary very slightly - perhaps hardly more than in a state of nature . A long list could easily be given of " sporting plants ; " by this term gardeners mean a single bud or offset ...
Otras ediciones - Ver todas
The Origin of Species by Means of Natural Selection: The Descent of Man and ... Charles Darwin Vista de fragmentos - 1952 |
On the Origin of Species by Means of Natural Selection . Charles Darwin Sin vista previa disponible - 2019 |
the origin of species by means of natural selection the descent of man and ... charles darwin Sin vista previa disponible - 1952 |
Términos y frases comunes
accumulated adapted affinities allied species America amount ancient animals appear become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species disuse divergence domestic doubt embryo endemic Europe existing exterminated extinct extremely facts favourable fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ less living look males mammals manner migration modification modified descendants natural selection naturalists nearly nest offspring organic organisation paleozoic perfect pigeons pistil plants pollen present probably produced progenitor ranked reciprocal crosses remarked resemble rudimentary seeds seems sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation varieties vary whole widely