The Darwinian Theory of the Transmutation of SpeciesJ. Nisbet, 1867 - Всего страниц: 386 |
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Стр. 23
... insects ' ( 48 ) . On this theme - the perplexity of the naturalists - he much enlarges Mr H. C. Watson has marked for me 182 British plants , which are considered as varieties , but which nevertheless have been ranked by botanists as ...
... insects ' ( 48 ) . On this theme - the perplexity of the naturalists - he much enlarges Mr H. C. Watson has marked for me 182 British plants , which are considered as varieties , but which nevertheless have been ranked by botanists as ...
Стр. 52
... insects green , and bark - feeders mottle- grey , the ptarmigan white in winter , the red grouse the col- our of the heather , and the black grouse that of peaty earth . Grouse , if not destroyed at some period of their lives , would ...
... insects green , and bark - feeders mottle- grey , the ptarmigan white in winter , the red grouse the col- our of the heather , and the black grouse that of peaty earth . Grouse , if not destroyed at some period of their lives , would ...
Стр. 56
... insects ; so that individuals , which could by any means defend them- selves from these small enemies , would be able to range in new pastures , and thus gain a great advantage . A well- developed tail having been formed in an aquatic ...
... insects ; so that individuals , which could by any means defend them- selves from these small enemies , would be able to range in new pastures , and thus gain a great advantage . A well- developed tail having been formed in an aquatic ...
Стр. 59
... insects , nor can we see any reason why this slowly - improving cow or horse should by this slight variation ' gain the victory in the competition for existence ; nevertheless , cows ' tails grew by Natural Selection , till at last they ...
... insects , nor can we see any reason why this slowly - improving cow or horse should by this slight variation ' gain the victory in the competition for existence ; nevertheless , cows ' tails grew by Natural Selection , till at last they ...
Стр. 60
... insects in the water , I see no difficulty in a race of bears being rendered by Natural Selection more and more aquatic in their struc- ture and habits , with larger and larger mouths , till a crea- ture was produced as monstrous as a ...
... insects in the water , I see no difficulty in a race of bears being rendered by Natural Selection more and more aquatic in their struc- ture and habits , with larger and larger mouths , till a crea- ture was produced as monstrous as a ...
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acknowledged advance ages Algæ amongst ancient appear beauty bees believe birds blood bones character contrivances creation creatures Cuvier Darwin Darwin's Theory descended difficulty distinct earth effected Eocene existence exterminated fact favoured female fertile fishes formation forms fossil genera geology germ giraffe gorilla habits hive-bee horse human hybrid imagination improvement infinite insects instance instinct intellect Lamarck larvæ learned limbs living Lucretius Lyell male means ment metaphor millions modification mutation Natural Selection naturalists never object observed organic Origin of Species passage perfect physiologists plants principle produced Professor progenitor proof quadrupeds race red clover reptiles respiration result says seems sequence of events Silurian soil spore sterility structure struggle suppose tail tapir Tertiary Theory of Transmutation things tion transformation TRANSMUTATION OF SPECIES Transmutationists Trémaux Trilobite variations varieties vertebral column vertebrata vertebrated animals whale whole words
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Стр. 20 - And God made the beast of the earth after his kind, and cattle after their kind, and every thing that creepeth upon the earth after his kind: and God saw that it was good.
Стр. 20 - And God said, Let the earth bring forth grass, the herb yielding seed and the fruit tree yielding fruit after his kind, whose seed is in itself, upon the earth: and it was so. And the earth brought forth grass, and herb yielding seed after his kind, and the tree yielding fruit, whose seed was in itself, after his kind: and God saw that it was good.
Стр. 371 - A few naturalists, endowed with much flexibility of mind, and who have already begun to doubt the immutability of species, may be influenced by this volume; but I look with confidence to the future, to young and rising naturalists, who will be able to view both sides of the question with impartiality.
Стр. 348 - Slow though the process of selection may be, if feeble man can do much by his powers of artificial selection, I can see no limit. to the amount of change, to the beauty and infinite complexity of the coadaptations between all organic beings, one with another and with their physical conditions of life, which may be effected in the long course of time by nature's power of selection.
Стр. 7 - In short, we shall have to treat species in the same manner as those naturalists treat genera, who admit that genera are merely artificial combinations made for convenience. This may not be a cheering prospect ; but we shall at least be freed from the vain search for the undiscovered and undiscoverable essence of the term species.
Стр. 232 - the recognition of an ideal Exemplar for the Vertebrated Animals proves that the Knowledge of such a being as Man must have existed before Man appeared. For the Divine mind which planned the Archetype also foreknew all its modifications. The Archetypal idea was manifested in the flesh, under divers modifications, upon this planet, long prior to the existence of those animal species that actually exemplify it.
Стр. 70 - Under changed conditions of life, it is at least possible that slight modifications of instinct might be profitable to a species ; and if it can be shown that instincts do vary ever so little, then I can see no difficulty in natural selection preserving and continually accumulating variations of instinct to any extent that was profitable. It is thus, as I believe, that all the most complex and wonderful instincts have originated.
Стр. 61 - The similar framework of bones in the hand of a man, wing of a bat, fin of the porpoise, and leg of the horse, — the same number of vertebrae forming the neck of the giraffe and of the elephant, — and innumerable other such facts, at once explain themselves on the theory of descent with slow and slight successive modifications.
Стр. 1 - These facts, as will be seen in the latter chapters of this volume, seemed to throw some light on the origin of species — that mystery of mysteries, as it has been called by one of our greatest philosophers.
Стр. 45 - It has been said that I speak of natural selection as an active power or Deity ; but who objects to an author speaking of the attraction of gravity as ruling the movements of the planets ? Everyone knows what is meant and is implied by such metaphorical expressions; and they are almost necessary for brevity.