The Naturalist as Interpreter and Seer ...Doubleday, Page, 1902 - Всего страниц: 173 |
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Стр. xi
... leaves or bark on which they feed that when motion- less they cannot be discerned . resemble dead , dry or decaying leaves so closely as to Some butterflies elude discovery . Every individual better protected by colour than others , has ...
... leaves or bark on which they feed that when motion- less they cannot be discerned . resemble dead , dry or decaying leaves so closely as to Some butterflies elude discovery . Every individual better protected by colour than others , has ...
Стр. xii
... leaves in disguise . Floral modes of repulsion and defence . Plants which devour insects , a habit gradually acquired . The mesquit tree Plants believed to indicate mineral tells of water . veins . Seeds as emigrants equipped with wings ...
... leaves in disguise . Floral modes of repulsion and defence . Plants which devour insects , a habit gradually acquired . The mesquit tree Plants believed to indicate mineral tells of water . veins . Seeds as emigrants equipped with wings ...
Стр. 73
... leaf it is accustomed to rest on , but the form and veining of the leaf or the exact rugosity of the bark is imitated ; and these detailed modi- fications cannot be reasonably imputed to climate or food , since in many cases the species ...
... leaf it is accustomed to rest on , but the form and veining of the leaf or the exact rugosity of the bark is imitated ; and these detailed modi- fications cannot be reasonably imputed to climate or food , since in many cases the species ...
Стр. 77
... leaf - thrushes , bee - eaters , white- eyes , ( turacos ) , and several smaller groups , have so much green in their plumage as to tend greatly to conceal them among the foliage . The conformity of tint which has been so far shown to ...
... leaf - thrushes , bee - eaters , white- eyes , ( turacos ) , and several smaller groups , have so much green in their plumage as to tend greatly to conceal them among the foliage . The conformity of tint which has been so far shown to ...
Стр. 78
... leaves are all repro- duced in its plumage , so that when according to its habit it rests upon the ground under trees , it is almost impossible to detect it . In snipes the colours are modified so as to be equally in harmony with the ...
... leaves are all repro- duced in its plumage , so that when according to its habit it rests upon the ground under trees , it is almost impossible to detect it . In snipes the colours are modified so as to be equally in harmony with the ...
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act of creation adapted admit algæ allied species Anchitherium Asa Gray bark beauty become beetles believe birds blossoms bone butterflies Charles Darwin closely allied colour common conceal creature descended developed digits distinct disuse diverged in character doubt early progenitor earth enemies Eocene equine Europe evidence evolution exactly existence extinct facts female fibula flowers forms fossils fungus genera genus germinal vesicle grinders groups habits Hence Hipparion horse important independently created inhabitants inherited injurious insects larvæ laws leaf living look lower animals males mammals manner marvel means Miocene modification moth natural selection naturalists organic Origin of Species Orohippus parasitic peculiar period Pliocene pollen present prey principle produced Professor Protohippus resemble rudimentary scale scale insects sexual selection slight structure successive teeth tend theory of creation theory of descent tints tion trees tropical ulna varieties whole widely different wild wings wonderful
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Стр. 37 - I happened to read for amusement 'Malthus on Population,' and being well prepared to appreciate the struggle for existence which everywhere goes on from long-continued observation of the habits of animals and plants, it at once struck me that under these circumstances favourable variations would tend to be preserved, and unfavourable ones to be destroyed. The result of this would be the formation of new species. Here then I had at last got a theory by which to work...
Стр. 34 - There is grandeur in this view of life, with its several powers, having been originally breathed by the Creator into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being evolved.
Стр. 68 - Important as the struggle for existence ha^s been and even still is, yet as far as the highest part of man's nature is concerned there are other agencies more important. For the moral qualities are advanced, either directly or indirectly, much more through the effects of habit, the reasoning powers, instruction, religion, etc., than through natural selection ; though to this latter agency the social instincts, which afforded the basis for the development of the moral sense, may be safely attributed.
Стр. 33 - 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 external conditions of life, and from use and disuse...
Стр. 29 - ... the summing up of the labour, the experience, the reason, and even the blunders of numerous workmen; when we thus view each organic being, how far more interesting — I speak from experience — does the study of natural history become!
Стр. 46 - ... man is descended from some less highly organized form. The grounds upon which this conclusion rests will never be shaken, for the close similarity between man and the lower animals in embryonic development, as well as in innumerable points of structure and constitution, both of high and of the most trifling importance — the rudiments which he retains, and the abnormal reversions to which he is occasionally liable — are facts which cannot be disputed.
Стр. 29 - We possess no pedigree or armorial bearings; and we have to discover and trace the many diverging lines of descent in our natural genealogies, by characters of any kind which have long been inherited. Rudimentary organs will speak infallibly with respect to the nature of long-lost structures. Species and groups of species which are called aberrant, and which may fancifully be called living fossils, will aid us in forming a picture of the ancient forms of life. Embryology will often reveal to us the...
Стр. 41 - I had, also, during many years followed a golden rule, namely, that whenever a published fact, a new observation or thought came across me, which was opposed to my general results, to make a memorandum of it without fail and at once; for I had found by experience that such facts and thoughts were far more apt to escape from the memory than favorable ones. Owing to this habit, very few objections were raised against my views which I had not at least noticed and attempted to answer.
Стр. 32 - In the distant future I see open fields for far more important researches. Psychology will be based on a new foundation, that of the necessary acquirement of each mental power and capacity by gradation. Light will be thrown on the origin of man and his history.
Стр. 38 - The solution, as I believe, is that the modified offspring of all dominant and increasing forms tend to become adapted to many and highly diversified places in the economy of nature.