The Darwinian Theory of the Transmutation of SpeciesJ. Nisbet, 1867 - Всего страниц: 386 |
Результаты поиска по книге
Результаты 1 – 5 из 79
Стр. 11
... structures are only adaptations to peculiarities of climate or country , for otherwise animals belonging to a distinct type , and introduced by man , would not succeed so admir- ably even to the extermination of the aborigines . On such ...
... structures are only adaptations to peculiarities of climate or country , for otherwise animals belonging to a distinct type , and introduced by man , would not succeed so admir- ably even to the extermination of the aborigines . On such ...
Стр. 20
... structure , or other particulars ; but the mutations thus superinduced are governed by constant laws , and the capability of so varying form part of the spe- cific character . 3. Some acquired peculiarities of form , structure , and ...
... structure , or other particulars ; but the mutations thus superinduced are governed by constant laws , and the capability of so varying form part of the spe- cific character . 3. Some acquired peculiarities of form , structure , and ...
Стр. 24
... structure of animals , and various have been the conjectures on the object of this organ and of the qualities of its secre- tion . It is a controversy not yet settled ; and so much has been said on the subject by many English and conti ...
... structure of animals , and various have been the conjectures on the object of this organ and of the qualities of its secre- tion . It is a controversy not yet settled ; and so much has been said on the subject by many English and conti ...
Стр. 32
... structure or instinct , correlated with the sterile condition of certain members of the community , has been advan- tageous to the community : consequently the fertile males and females of the same community flourished , and transmitted ...
... structure or instinct , correlated with the sterile condition of certain members of the community , has been advan- tageous to the community : consequently the fertile males and females of the same community flourished , and transmitted ...
Стр. 38
... was ' unwilling to believe ' till convinced of the fact ( 286 ) . That in unnatural crossings the organization has been dis- turbed by two different structures and constitutions having been blended 38 MR DARWIN'S CENSURE OF SPECIES .
... was ' unwilling to believe ' till convinced of the fact ( 286 ) . That in unnatural crossings the organization has been dis- turbed by two different structures and constitutions having been blended 38 MR DARWIN'S CENSURE OF SPECIES .
Другие издания - Просмотреть все
Часто встречающиеся слова и выражения
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
Популярные отрывки
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.