On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJ. Murray, 1860 - 502페이지 This is the 'second edition' of Darwin's Origin of Species. |
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vii 페이지
... DIFFICULTIES ON THEORY . Difficulties on the theory of descent with modification - Transitions-- Absence or rarity of ... difficulty- Natura non facit saltum - Organs of small importance — Organs not in all cases absolutely perfect - The ...
... DIFFICULTIES ON THEORY . Difficulties on the theory of descent with modification - Transitions-- Absence or rarity of ... difficulty- Natura non facit saltum - Organs of small importance — Organs not in all cases absolutely perfect - The ...
ix 페이지
... difficulties in classification , explained on the theory of descent with modification Classification of varieties - Descent always used in classification - Analogical or adaptive characters -Affinities , general , complex and radiating ...
... difficulties in classification , explained on the theory of descent with modification Classification of varieties - Descent always used in classification - Analogical or adaptive characters -Affinities , general , complex and radiating ...
xi 페이지
... Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one or more Species - Domestic Pigeons , their Differences and Origin — Principle of Selection anciently followed , its Effects- Methodical ...
... Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one or more Species - Domestic Pigeons , their Differences and Origin — Principle of Selection anciently followed , its Effects- Methodical ...
5 페이지
... difficulties on the theory will be given : namely , first , the difficulties of transi- tions , or in understanding how a simple being or a simple organ can be changed and perfected into a highly developed being or elaborately ...
... difficulties on the theory will be given : namely , first , the difficulties of transi- tions , or in understanding how a simple being or a simple organ can be changed and perfected into a highly developed being or elaborately ...
14 페이지
... difficulty in proving its truth : we may safely con- clude that very many of the most strongly - marked domestic varieties could not possibly live in a wild state . In many cases we do not know what the aboriginal stock was , and so ...
... difficulty in proving its truth : we may safely con- clude that very many of the most strongly - marked domestic varieties could not possibly live in a wild state . In many cases we do not know what the aboriginal stock was , and so ...
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accumulated adapted affinities allied species America amount analogous ancient animals appear become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo Europe existing exterminated extinct extremely facts favourable Fcap 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 land larvæ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons plants pollen present probably produced progenitor racters ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive supposed tend theory tion variability variations varieties vary whole widely