The Darwinian Theory of the Transmutation of SpeciesJ. Nisbet, 1867 - Всего страниц: 386 |
Результаты поиска по книге
Результаты 1 – 5 из 63
Стр. 4
... character differing from their congeners , in having the quality of greater permanency— ' they are more permanent ' -these more permanent varieties are gradually advancing to the higher dignity of sub - species , and so ultimately to ...
... character differing from their congeners , in having the quality of greater permanency— ' they are more permanent ' -these more permanent varieties are gradually advancing to the higher dignity of sub - species , and so ultimately to ...
Стр. 5
... character and quality , is to take place , and the fluctuating Variety is to become a good and distinct Species . ' If this does not show an essential differ- ence , how is it to be shown ? and what more could we con- tend for who are ...
... character and quality , is to take place , and the fluctuating Variety is to become a good and distinct Species . ' If this does not show an essential differ- ence , how is it to be shown ? and what more could we con- tend for who are ...
Стр. 8
... characters , and in the whole of my experience , with many thousands of Humming Birds pass- ing through my hands , I have never observed an instance of any variation which would lead me to suppose that it was the result of a union of ...
... characters , and in the whole of my experience , with many thousands of Humming Birds pass- ing through my hands , I have never observed an instance of any variation which would lead me to suppose that it was the result of a union of ...
Стр. 9
... character of Species , an acknowledgment which of course would be fatal to his theory ; but Mr Darwin so often deals fatal blows with his own hands against his own system , without any apparent suspicion of having done it any injury ...
... character of Species , an acknowledgment which of course would be fatal to his theory ; but Mr Darwin so often deals fatal blows with his own hands against his own system , without any apparent suspicion of having done it any injury ...
Стр. 12
... character , that it denies the fixedness of nature and invests all living organisms with inherent mutability . Alterations , transmutation , and conversion ' into new states and forms of life , even into those most unlike pre- viously ...
... character , that it denies the fixedness of nature and invests all living organisms with inherent mutability . Alterations , transmutation , and conversion ' into new states and forms of life , even into those most unlike pre- viously ...
Другие издания - Просмотреть все
Часто встречающиеся слова и выражения
able according acknowledged action advance advantage ages animals appear arrangement beauty become bees beginning believe birds blood body bones called cause certain character common condition considered continually course created creation creatures Darwin difficulty direction distinct earth effected evidence existence explain expressed exterminated fact favoured fishes formation forms geology give habits hand human ignorance imagination improvement individual instance instinct intellect known learned less light living lower matter means millions modification Natural Selection never object observed organic origin passage perfect period plants present principle produced progenitor progress proof proved question race reason remarks result says School seems seen Silurian soil species sterility structure struggle succession suppose term Theory things thousand tion transformation Transmutation true turn varieties whole
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.