The Naturalist as Interpreter and Seer ...Doubleday, Page, 1902 - 173페이지 |
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31개의 결과 중 1 - 5개
xi 페이지
... less they cannot be discerned . Some butterflies resemble dead , dry or decaying leaves so closely as to elude discovery . Every individual better protected by colour than others , has a better chance for life , and of transmitting his ...
... less they cannot be discerned . Some butterflies resemble dead , dry or decaying leaves so closely as to elude discovery . Every individual better protected by colour than others , has a better chance for life , and of transmitting his ...
4 페이지
... less amount of difference than do the species of smaller genera . The closely allied species also of a larger genera ap- parently have restricted ranges , and in their affinities they are clustered in little groups round other species ...
... less amount of difference than do the species of smaller genera . The closely allied species also of a larger genera ap- parently have restricted ranges , and in their affinities they are clustered in little groups round other species ...
5 페이지
... less dominant . This tendency in the large groups to go on increasing in size and diverging in character , together with the inevitable contingency of much extinction , explains the arrangement of all the forms of life in groups ...
... less dominant . This tendency in the large groups to go on increasing in size and diverging in character , together with the inevitable contingency of much extinction , explains the arrangement of all the forms of life in groups ...
12 페이지
... less improved forms in the struggle for life ; they have also generally had their organs more specialized for different functions . This fact is perfectly compatible with numerous beings still retaining simple but little improved ...
... less improved forms in the struggle for life ; they have also generally had their organs more specialized for different functions . This fact is perfectly compatible with numerous beings still retaining simple but little improved ...
24 페이지
... The question is difficult to answer , because the more distinct the forms are which we consider , by so much the arguments in favour of community of descent become fewer in number and less in force . But 24 Masterpieces of Science.
... The question is difficult to answer , because the more distinct the forms are which we consider , by so much the arguments in favour of community of descent become fewer in number and less in force . But 24 Masterpieces of Science.
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adaptation admit algæ allied Anchitherium appeared Asa Gray bark beauty become bees beetle believe birds black scale blossoms bone butterflies California characters Charles Darwin closely colour Colours of Animals common conceal conclusion creation creature Darwin deposits descended developed digits distinct doubt earth enemies Eocene equine Europe evidence evolution exactly existence extinct facts favourable female fibula flowers forms fossils fungus genera genus green grinders groups habits Hence Hipparion horse Huxley important individuals inhabitants inherited injurious insects ladybird larvæ laws leaf leaves living lower animals Lyell males mammals ment Miocene modification moth natural selection naturalists organic Origin of Species Orohippus parasitic peculiar plants Pliocene pollen present prey principle produced Professor protective Protohippus races resemble scale insects sexual selection slight social instincts structure success teeth theory tints tion trees tropical ulna variation varieties wild wings wonderful
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33 페이지 - As all the living forms of life are the lineal descendants of those which lived long before the Cambrian epoch, we may feel certain that the ordinary succession by generation has never once been broken, and that no cataclysm has desolated the whole world. Hence we may look with some confidence to a secure future of great length. And as natural selection works solely by and for the good of each being, all corporeal and mental endowments will tend to progress towards perfection.
33 페이지 - It is interesting to contemplate an entangled bank, clothed with many plants of many kinds, with birds singing on the bushes, with various insects flitting about, and with worms crawling through the damp earth, and to reflect that these elaborately constructed forms, so different from each other, and dependent upon each other in so complex a manner, have all been produced by laws acting around us.
37 페이지 - I happened to read for amusement ' Malthus on Population ' ; and being well prepared to appreciate the struggle for existence which everywhere goes on from longcontinued observation of the habits of animals and plants, it at once struck me that under these circumstances favorable variations would tend to be preserved, and unfavorable 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...
34 페이지 - 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.
29 페이지 - 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...
36 페이지 - It was evident that such facts as these, as well as many others, could only be explained on the supposition that species gradually become modified ; and the subject haunted me. But it was equally evident that neither the action of the surrounding conditions, nor the will of the organisms (especially in the case of plants) could account for the innumerable cases in which organisms of every kind are beautifully adapted to their habits of life — for instance, a woodpecker or a tree-frog to climb trees,...
41 페이지 - 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.
38 페이지 - 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.
46 페이지 - ... man is descended from some less highly organized form. The grounds upon which this conclusion rests will never be shaken, for the 45 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.
20 페이지 - A celebrated author and divine has written to me that 'he has gradually learnt to see that it is just as noble a conception of the Deity to believe that He created a few original forms capable of...