Contributions to the Theory of Natural Selection: A Series of Essays |
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Page 17
... physical conditions have served as the antitypes on which to found the new races . In this manner alone , it is believed , can the representative groups at successive periods , and the risings and fallings in the scale of organization ...
... physical conditions have served as the antitypes on which to found the new races . In this manner alone , it is believed , can the representative groups at successive periods , and the risings and fallings in the scale of organization ...
Page 18
... physical con- ditions of a district would be most favourable to the existence of organic life in the greatest abundance , both as regards individuals and also as to variety of species and generic group , just as we now find that the ...
... physical con- ditions of a district would be most favourable to the existence of organic life in the greatest abundance , both as regards individuals and also as to variety of species and generic group , just as we now find that the ...
Page 32
... physically unchanged , the numbers of its animal population cannot ma- terially increase . If one species does so , some others requiring the same kind of food must diminish in proportion . The numbers that die annually must be immense ...
... physically unchanged , the numbers of its animal population cannot ma- terially increase . If one species does so , some others requiring the same kind of food must diminish in proportion . The numbers that die annually must be immense ...
Page 35
... physical conditions occur in the district - a long period of drought , a destruction of vegetation by locusts , the irruption of some new carnivorous animal seeking 66 pastures new D 2 INDEFINITELY FROM THE ORIGINAL TYPE . 35.
... physical conditions occur in the district - a long period of drought , a destruction of vegetation by locusts , the irruption of some new carnivorous animal seeking 66 pastures new D 2 INDEFINITELY FROM THE ORIGINAL TYPE . 35.
Page 36
... existence . Granted , therefore , a " tendency " to reproduce the original type of the species , still the variety must ever re- main preponderant in numbers , and under adverse physical conditions 36 ON THE TENDENCY OF VARIETIES TO DEPART.
... existence . Granted , therefore , a " tendency " to reproduce the original type of the species , still the variety must ever re- main preponderant in numbers , and under adverse physical conditions 36 ON THE TENDENCY OF VARIETIES TO DEPART.
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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 |
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abundant adapted affinity animals antennæ antitypes appear beauty become beetles believe birds Borneo brain build butterflies caterpillars causes Celebes changes character closely allied species colour concealed conspicuous Crown 8vo curious Danaidæ Darwin Diphilus distinct earth Edition eggs epoch essay exactly example existence explained extinct facts faculties favourable flowers genera genus geological geological periods groups habits Heliconidæ Illustrations imitation India individuals inhabiting insects instinct islands Java larvæ Lepidoptera less Malayan male mimic mimicry mode modifications Moluccas moths natural selection nectary nest never nidification number of species observations occur Origin of Species Ormenus Pammon Papilio Papilio Ulysses Papilionidæ peculiar period phenomena physical Polydorus possess present probably produced Professor protection race regions remarkable render resemble savage Science sexes sexual selection shown structure Sumatra tail theory of natural Theseus tints tion TREATISE trees tropical University variation varied varieties whole wings
Popular passages
Page 361 - But the passage from the physics of the brain to the corresponding facts of consciousness is unthinkable. Granted that a definite thought and a definite molecular action in the brain occur simultaneously; we do not possess the intellectual organ, nor apparently any rudiment of the organ, which would enable us to pass, by a process of reasoning, from the one to the other.
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Page 326 - natural selection' himself, but he is actually able to take away some of that power from nature which, before his appearance, she universally exercised. We can anticipate the time when the earth will produce only cultivated plants and domestic animals ; when man's selection shall have supplanted
Page 8 - The book will doubtless find a place in the library, not only of the scientific geologist, but also of all who are desirous of the industrial progress and commercial prosperity of the Acadian provinces.