On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for LifeJohn Murray, 1882 - 458페이지 |
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xvi 페이지
... side of change . The Vestiges of Creation ' appeared in 1844. In the tenth and much improved edition ( 1853 ) the anonymous author says ( p . 155 ) : - The proposition determined on after much considera- tion is , that the several ...
... side of change . The Vestiges of Creation ' appeared in 1844. In the tenth and much improved edition ( 1853 ) the anonymous author says ( p . 155 ) : - The proposition determined on after much considera- tion is , that the several ...
2 페이지
... sides of each question ; and this is here impossible . I much regret that want of space prevents my having the satis- faction of acknowledging the generous assistance which I have received from very many naturalists , some of them ...
... sides of each question ; and this is here impossible . I much regret that want of space prevents my having the satis- faction of acknowledging the generous assistance which I have received from very many naturalists , some of them ...
44 페이지
... side , and all those in the smaller genera on the other side , the former will be found to include a somewhat larger number of the very common and much diffused or dominant species . This might have been antici- pated ; for the mere ...
... side , and all those in the smaller genera on the other side , the former will be found to include a somewhat larger number of the very common and much diffused or dominant species . This might have been antici- pated ; for the mere ...
45 페이지
... side of the larger genera presented varieties , than on the side of the smaller genera . Moreover , the species of the large genera which present any varieties , invariably present a larger average number of varieties than do the ...
... side of the larger genera presented varieties , than on the side of the smaller genera . Moreover , the species of the large genera which present any varieties , invariably present a larger average number of varieties than do the ...
104 페이지
... sides , and to overtop and kill the surrounding twigs and branches , in the same manner as species and groups of species have at all times overmastered other species in the great battle for life . The limbs divided into great branches ...
... sides , and to overtop and kill the surrounding twigs and branches , in the same manner as species and groups of species have at all times overmastered other species in the great battle for life . The limbs divided into great branches ...
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adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common progenitor continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formations formerly forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed theory tion variability variations varieties vary whilst whole wings young
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428 페이지 - 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.
424 페이지 - Analogy would lead me one step further, namely, to the belief that all animals and plants have descended from some one prototype. But analogy may be a deceitful guide.
322 페이지 - Every species has come into existence coincident both in space and time with a pre-existing closely allied species.
23 페이지 - ... that which enables the agriculturist, not only to modify the character of his flock, but to change it altogether. It is the magician's wand, by means of which he may summon into life whatever form and mould he pleases.
63 페이지 - If such do occur, can we doubt (remembering that many more individuals are born than can possibly survive) that individuals having any advantage, however slight, over others, would have the best chance of surviving and of procreating their kind? On the other hand, we may feel sure that any variation in the least degree injurious would be rigidly destroyed.
426 페이지 - ... when we regard every production of nature as one which has had a long history; when we contemplate every complex structure and instinct as the summing up of many contrivances, each useful to the possessor...
50 페이지 - Two canine animals, in a time of dearth, may be truly said to struggle with each other which shall get food and live. But a plant on the edge of a desert is said to struggle for life against the drought, though more properly it should be said to be dependent on the moisture.
3 페이지 - As many more individuals of each species are born than can possibly survive; and as, 'consequently, there is a frequently recurring struggle for existence, it follows that any being, if it vary however slightly in any manner profitable to itself, under the complex and sometimes varying conditions of life, will have a better chance of surviving, and thus be naturally selected.
63 페이지 - Several writers have misapprehended or objected to the term Natural Selection, Some have even imagined that natural selection induces variability, whereas it' implies only the. preservation of such variations as arise and are beneficial to the being under its conditions of * life.
388 페이지 - In my possession are two little embryos in spirit, whose names I have omitted to attach, and at present I am quite unable to say to what class they belong. They may be lizards or small birds, or very young mammalia, so complete is the similarity in the mode of formation of the head and trunk in these animals.