On the Origin of Species by Means of Natural Selection: Or The Preservation of Favoured Races in the Struggle for Life |
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Page 8
... separated by any clear line of distinction from mere variations . But I am strongly inclined to suspect that the most frequent cause of variability may be attributed to the male and female reproductive elements having been affected ...
... separated by any clear line of distinction from mere variations . But I am strongly inclined to suspect that the most frequent cause of variability may be attributed to the male and female reproductive elements having been affected ...
Page 33
... separating some very distinct variety , and breeding from it , the principle would be so obvious as hardly to be worth notice ; but its importance consists in the great effect produced by the accumulation in one direction , during ...
... separating some very distinct variety , and breeding from it , the principle would be so obvious as hardly to be worth notice ; but its importance consists in the great effect produced by the accumulation in one direction , during ...
Page 53
... separated areas . How many of those birds . and insects in North America and Europe , which differ very slightly from each other , have been ranked by one eminent naturalist as undoubted species , and by another as varieties , or , as ...
... separated areas . How many of those birds . and insects in North America and Europe , which differ very slightly from each other , have been ranked by one eminent naturalist as undoubted species , and by another as varieties , or , as ...
Page 105
... separation of the sexes of plants , presently to be alluded to . Some holly - trees bear only male flowers , which have four stamens producing a rather small quantity of pollen , and a rudimentary pistil ; other holly - trees bear only ...
... separation of the sexes of plants , presently to be alluded to . Some holly - trees bear only male flowers , which have four stamens producing a rather small quantity of pollen , and a rudimentary pistil ; other holly - trees bear only ...
Page 106
... separation of the sexes of our plant would be advantageous on the principle of the division of labour , individuals with this tendency more and more increased , would be continually favoured or selected , until at last a complete separation ...
... separation of the sexes of our plant would be advantageous on the principle of the division of labour , individuals with this tendency more and more increased , would be continually favoured or selected , until at last a complete separation ...
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Common terms and phrases
adapted affinities allied species America analogous ancient appear archipelago become bees believe birds breeds cause cells characters climate closely allied colour common continued crossed crustaceans degree difficulty distinct species doubt Edition eggs embryo Europe existing exterminated extinct extremely facts favourable Fcap females fertilised fertility flowers formation forms fossil Fritz Müller Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites History hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ less living male mammals manner migration modification modified descendants natural selection naturalists nearly nest offspring organic organisation parent perfect pigeons pistil plants pollen Post 8vo present principle probably produced progenitor racters ranked reciprocal crosses remarked resemble rudimentary seeds Silurian slight South America stamens sterility structure struggle successive supposed theory tion variability variations varieties vary Vols whole widely Woodcuts