The Origin of Species by Means of Natural Selection, Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1900 - 432페이지 |
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20 페이지
... regions are often sterile when crossed ; now it could clearly have been of no advantage to such sepa- rated species to have been rendered mutually sterile , and consequently this could not have been effected through natural selection ...
... regions are often sterile when crossed ; now it could clearly have been of no advantage to such sepa- rated species to have been rendered mutually sterile , and consequently this could not have been effected through natural selection ...
60 페이지
... , accord with the belief of vast intervals of time having elapsed between each formation . We can , I think , see why the geological formations of each region are almost invariably intermittent ; that is 60 [ CHAP . X. THE POORNESS OF OUR.
... , accord with the belief of vast intervals of time having elapsed between each formation . We can , I think , see why the geological formations of each region are almost invariably intermittent ; that is 60 [ CHAP . X. THE POORNESS OF OUR.
61 페이지
Charles Darwin. of each region are almost invariably intermittent ; that is , have not followed each other in close sequence . Scarcely any fact struck me more when examining many hundred miles of the South American coasts , which have ...
Charles Darwin. of each region are almost invariably intermittent ; that is , have not followed each other in close sequence . Scarcely any fact struck me more when examining many hundred miles of the South American coasts , which have ...
64 페이지
... region of Parime is described by Humboldt as being at least nineteen times as large as Switzerland . South of the Amazon , Boué colours an area composed of rocks of this nature as equal to that of Spain , France , Italy , part of ...
... region of Parime is described by Humboldt as being at least nineteen times as large as Switzerland . South of the Amazon , Boué colours an area composed of rocks of this nature as equal to that of Spain , France , Italy , part of ...
65 페이지
... region , namely , to the United States and Canada , as shown in Professor H. D. Rogers's beautiful map , I have ... regions the metamorphic and granitic rocks would be found much more widely ex- tended than they appear to be , if ...
... region , namely , to the United States and Canada , as shown in Professor H. D. Rogers's beautiful map , I have ... regions the metamorphic and granitic rocks would be found much more widely ex- tended than they appear to be , if ...
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admit affinity allied species ancient animals appear Archipelago arctic areas become believe belonging birds Cambrian changes characters cies classification climate closely allied common progenitor continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo eral Europe existing extinct fact faunas fertilised fertility flowers formations formerly forms fossil fresh-water Fritz Müller Gärtner genera genus geological period geological record Glacial period groups of species habits hybrids hybrids produced important individuals inhabitants inherited insects instance intervals land larvæ less living mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs sediment seeds Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations whilst whole widely different wings
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141 페이지 - Every species has come into existence coincident both in space and time with a pre-existing closely allied species.
296 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 self-development into other and needful forms, as to believe that He required a fresh act of creation to supply the voids caused by the action of His laws.
235 페이지 - Nothing can be more hopeless than to attempt to explain this similarity of pattern in members of the same class, by utility or by the doctrine of final causes. The hopelessness of the attempt has been expressly admitted by Owen in his most interesting work on the
87 페이지 - Nevertheless, the difficulty of assigning any good reason for the absence of vast piles of strata rich in fossils beneath the Cambrian system is very great.
282 페이지 - What limit can be put to this power, acting during long ages and rigidly scrutinising the whole constitution, structure, and habits of each creature, — favouring the good and rejecting the bad?
304 페이지 - A grand and almost untrodden field of inquiry will be opened, on the causes and laws of variation, on correlation, on the effects of use and disuse, on the direct action of external conditions, and so forth. The study of domestic productions will rise immensely in value. A new variety raised by man will be a more important and interesting subject for study than one more species added to the infinitude of already recorded species. Our classifications will come to be, as far as they can be so made,...
53 페이지 - He who can read Sir Charles Lyell's grand work on the Principles of Geology, which the future historian will recognise as having produced a revolution in natural science, yet does not admit how incomprehensibly vast have been the past periods of time, may at once close this volume.
296 페이지 - I see no good reason why the views given in this volume should shock the religious feelings of any one.
307 페이지 - It is interesting to contemplate a tangled 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.
306 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.