The Naturalist as Interpreter and Seer ...Doubleday, Page, 1902 - 173 стор. |
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Сторінка viii
... once deemed parasitic . The pea and its kindred harbor on their rootlets cer- tain tiny lodgers ; the tenants pay a liberal rent in the form of nitrogen compounds , a striking interlacement of interests ! GEORGE ILES . viii CONTENTS ...
... once deemed parasitic . The pea and its kindred harbor on their rootlets cer- tain tiny lodgers ; the tenants pay a liberal rent in the form of nitrogen compounds , a striking interlacement of interests ! GEORGE ILES . viii CONTENTS ...
Сторінка 5
... once acquired is long inherited , and structures already modified in many different ways have to be adapted for the same general purpose . We can , in short , see why nature is prodigal in variety , though niggard in innovation . But ...
... once acquired is long inherited , and structures already modified in many different ways have to be adapted for the same general purpose . We can , in short , see why nature is prodigal in variety , though niggard in innovation . But ...
Сторінка 11
... once why their crossed offspring should follow the same complex laws in their degrees and kinds of resemblance to their parents - in being absorbed into each other by successive crosses , and in other such points- as do the crossed ...
... once why their crossed offspring should follow the same complex laws in their degrees and kinds of resemblance to their parents - in being absorbed into each other by successive crosses , and in other such points- as do the crossed ...
Сторінка 12
ordinary generation is once broken . The gradual diffusion of dominant forms , with the slow modi- fication of their descendants , causes the forms of life , after long intervals of time , to appear as if they had changed simultaneously ...
ordinary generation is once broken . The gradual diffusion of dominant forms , with the slow modi- fication of their descendants , causes the forms of life , after long intervals of time , to appear as if they had changed simultaneously ...
Сторінка 16
... once ex- plain themselves on the theory of descent with slow and slight successive modifications . The similarity of pattern in the wing and in the leg of a bat , though used for such different purpose —in the jaws and legs of a crab ...
... once ex- plain themselves on the theory of descent with slow and slight successive modifications . The similarity of pattern in the wing and in the leg of a bat , though used for such different purpose —in the jaws and legs of a crab ...
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Загальні терміни та фрази
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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Сторінка 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...
Сторінка 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.
Сторінка 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.
Сторінка 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...
Сторінка 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!
Сторінка 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.
Сторінка 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...
Сторінка 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.
Сторінка 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.
Сторінка 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.