On the Origin of Species: By Means of Natural Selection, Or, the Preservation of Favored Races in the Struggle for LifeAppleton, 1883 - Всего страниц: 458 |
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Стр. xii
... fossils beneath the Cam- brian system , corrected . Natural selection not the exclusive agency in the modi- fication of species , as always maintained in this work . The belief in the separate creation of species generally held by ...
... fossils beneath the Cam- brian system , corrected . Natural selection not the exclusive agency in the modi- fication of species , as always maintained in this work . The belief in the separate creation of species generally held by ...
Стр. xx
... Fossil Sloths , expressed , in 1821 , a similar belief . Similar views have , as is well known , been maintained by Oken in his mystical ' Natur - Philosophie . ' From other references in Godron's work ' Sur l'Espèce , ' it seems that ...
... Fossil Sloths , expressed , in 1821 , a similar belief . Similar views have , as is well known , been maintained by Oken in his mystical ' Natur - Philosophie . ' From other references in Godron's work ' Sur l'Espèce , ' it seems that ...
Стр. 42
... fossil land- shells in Madeira , and with plants by Gaston de Saporta . If a variety were to flourish so as to exceed in numbers the parent species , it would them rank as the species , and the species as the variety ; or it might come ...
... fossil land- shells in Madeira , and with plants by Gaston de Saporta . If a variety were to flourish so as to exceed in numbers the parent species , it would them rank as the species , and the species as the variety ; or it might come ...
Стр. 83
... fossils , connect to a certain extent orders at present widely sundered in the natural scale . These anomalous forms may be called living fossils ; they have endured to the present day , from having inhabited a confined area , and from ...
... fossils , connect to a certain extent orders at present widely sundered in the natural scale . These anomalous forms may be called living fossils ; they have endured to the present day , from having inhabited a confined area , and from ...
Стр. 104
... fossil state . As we here and there see a thin straggling branch springing from a fork low down in a tree , and which by some chance has been favoured and is still alive on its summit , so we occasionally see an animal like the ...
... fossil state . As we here and there see a thin straggling branch springing from a fork low down in a tree , and which by some chance has been favoured and is still alive on its summit , so we occasionally see an animal like the ...
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adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formations forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed theory tion variability variations varieties vary whilst whole wings young
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Стр. 65 - It may be said that natural selection is daily and hourly scrutinising, throughout the world, every variation, even the slightest; rejecting that which is bad, preserving and adding up all that is good; silently and insensibly working, whenever and wherever opportunity offers, at the improvement of each organic being in relation to its organic and inorganic conditions of life.
Стр. 104 - The green and budding twigs may represent existing species, and those produced during former years may represent the long succession of extinct species. At each period of growth all the growing twigs have tried to branch out on all sides, and to overtop and kill the surrounding twigs and branches, in the same manner as species and groups of species have at all times overmastered other species in the great battle for life.
Стр. 57 - Newman, who has long attended to the habits of humble-bees believes that 'more than two-thirds of them are thus destroyed all over England'.
Стр. 23 - ... that which enables the agriculturist not only to modify the character of his flock, but to change it altogether. It is the magician's wand, by means of which he may summon into life whatever form and mould he pleases.
Стр. 146 - If it could be demonstrated that any complex organ existed which could not possibly have been formed by numerous, successive, slight modifications, my theory would absolutely break down.
Стр. 50 - But a plant on the edge of a desert is said to struggle for life against the drought, though more properly it should be said to be dependent on the moisture.
Стр. 429 - These laws, taken in the largest sense, being Growth with reproduction; Inheritance which is almost implied by reproduction; Variability from the indirect and direct action of the conditions of life, and from use and disuse...
Стр. 104 - The limbs divided into great branches, and these into lesser and lesser branches, were themselves once, when the tree was young, budding twigs; and this connection of the former and present buds, by ramifying branches, may well represent the classification of all extinct and living species in groups subordinate to groups.
Стр. 425 - Nevertheless all living things have much in common, in their chemical composition, their cellular structure, their laws of growth, and their liability to injurious influences.
Стр. 2 - ... species had not been independently created, but had descended, like varieties, from other species. Nevertheless, such a conclusion, even if well founded, would be unsatisfactory, until it could be shown how the innumerable species inhabiting this world have been modified so as to acquire that perfection of structure and co-adaptation which justly excites our admiration.