Contributions to the Theory of Natural Selection: A Series of EssaysMacmillan and Company, 1870 - 384 pages |
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Page xiii
... Increase , useless or hurtful Variations to Diminish - Superior Varieties will ultimately extirpate the Ori- ginal Species - The Partial Reversion of Domesticated Varieties explained - Lamarck's Hypothesis very different from that now ...
... Increase , useless or hurtful Variations to Diminish - Superior Varieties will ultimately extirpate the Ori- ginal Species - The Partial Reversion of Domesticated Varieties explained - Lamarck's Hypothesis very different from that now ...
Page 2
... been gradual : the first appearance of animals now existing can in many cases be traced , their numbers gradually increasing in the more re- cent formations , while other species continually die out and 2 ON THE LAW WHICH HAS REGULATED.
... been gradual : the first appearance of animals now existing can in many cases be traced , their numbers gradually increasing in the more re- cent formations , while other species continually die out and 2 ON THE LAW WHICH HAS REGULATED.
Page 3
... increase of our knowledge within the last twenty years , both of the present and past history of the organic world , has accumulated a body of facts which should afford a sufficient foundation for a comprehensive law embracing and ...
... increase of our knowledge within the last twenty years , both of the present and past history of the organic world , has accumulated a body of facts which should afford a sufficient foundation for a comprehensive law embracing and ...
Page 19
... increase . In a period of geological activity , on the other hand , it seems probable that the extinctions might exceed the creations , and the number of species consequently diminish . That such effects did take place in con- nexion ...
... increase . In a period of geological activity , on the other hand , it seems probable that the extinctions might exceed the creations , and the number of species consequently diminish . That such effects did take place in con- nexion ...
Page 29
... increasing every year in a geometrical ratio , as they would do , were there not some powerful check to their natural increase . Very few birds produce less than two young ones each year , while many have six , eight , or ten ; four ...
... increasing every year in a geometrical ratio , as they would do , were there not some powerful check to their natural increase . Very few birds produce less than two young ones each year , while many have six , eight , or ten ; four ...
Other editions - View all
Contributions to the Theory of Natural Selection: A Series of Essays ... Alfred Russel Wallace No preview available - 2018 |
Contributions to the Theory of Natural Selection: A Series of Essays Alfred Russel Wallace No preview available - 2016 |
Common terms and phrases
abundant action adapted alike Amboyna animals antennæ appear beautiful become bees beetles birds Borneo brain brilliant build butterflies caterpillars causes Celebes changes character closely allied species colour concealed conspicuous Crown 8vo curious Darwin Diphilus distinct Edition eggs essay evidence exactly existence external extinct Extra fcap facts faculties favourable Fcap flowers genera genus geological groups Guinea habits Heliconidæ imitation India individuals inhabiting insects instinct islands Java larvæ Lepidoptera less Malayan male Mimeta mimic mimicry mode modified Moluccas moths natural selection nectary nest never nidification number of species observations occur organic Origin of Species Ormenus Pammon Papilio Papilio Ulysses Papilionidæ peculiar perfect period phenomena POEMS Polydorus possess present probably produced protection race regions remarkable render resemble savage sexes sexual sexual selection shown structure Sumatra tail theory of natural Theseus tints tion trees tropical variation varied varieties whole wings
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