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 10
... formations - On the absence of intermediate varieties in any one formation - On the sudden appearance of groups of species - On their sudden appearance in the lowest known fossiliferous strata 245 CHAPTER X ON THE GEOLOGICAL SUCCESSION ...
... formations - On the absence of intermediate varieties in any one formation - On the sudden appearance of groups of species - On their sudden appearance in the lowest known fossiliferous strata 245 CHAPTER X ON THE GEOLOGICAL SUCCESSION ...
Page 21
... formation ; so that , in fact , ' sports ' support the view , that variability may be largely attributed to the ovules or pollen , or to both , having been affected by the treatment of the parent prior to the act of con- ception ...
... formation ; so that , in fact , ' sports ' support the view , that variability may be largely attributed to the ovules or pollen , or to both , having been affected by the treatment of the parent prior to the act of con- ception ...
Page 46
... formation of new races , at least , in a country which is already stocked with other races . In this respect enclosure of the land plays a part . Wandering savages or the inhabitants of open plains rarely possess more than one breed of ...
... formation of new races , at least , in a country which is already stocked with other races . In this respect enclosure of the land plays a part . Wandering savages or the inhabitants of open plains rarely possess more than one breed of ...
Page 47
... formation of new breeds . Pigeons , I may add , can be propagated in great numbers and at a very quick rate , and inferior birds may be freely rejected , as when killed they serve for food . On the other hand , cats , from their ...
... formation of new breeds . Pigeons , I may add , can be propagated in great numbers and at a very quick rate , and inferior birds may be freely rejected , as when killed they serve for food . On the other hand , cats , from their ...
Page 48
... formation of new sub - breeds ; but the importance of the crossing of varieties has been greatly exaggerated , both in regard to animals and to those plants which are propagated by seed . In plants which are temporarily propagated by ...
... formation of new sub - breeds ; but the importance of the crossing of varieties has been greatly exaggerated , both in regard to animals and to those plants which are propagated by seed . In plants which are temporarily propagated by ...
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Common terms and phrases
accumulated adapted affinities allied species America analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo endemic existing exterminated extinct extremely facts favourable fertilised fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely