The Philosophy of EvolutionJ. Van Voorst, 1873 - 159 páginas |
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Página 6
... phenomena are inexplicable on the other received theory ( that of special creations ) ; or they are thought to be explained by the addition of hypotheses which are not the result of inference from known facts , but which are merely ...
... phenomena are inexplicable on the other received theory ( that of special creations ) ; or they are thought to be explained by the addition of hypotheses which are not the result of inference from known facts , but which are merely ...
Página 10
... phenomena most satisfactorily . Some phenomena undoubtedly re- main unexplained ; but so many are explained that we are surely justified , as in the case of the in- scription , in believing that the hypothesis is proven . NATURE OF THE ...
... phenomena most satisfactorily . Some phenomena undoubtedly re- main unexplained ; but so many are explained that we are surely justified , as in the case of the in- scription , in believing that the hypothesis is proven . NATURE OF THE ...
Página 11
... phenomena from it " * . The sweeping assertion is frequently made that the explanation of numerous facts ( i . e . of their causation ) is no proof of the truth of an hypothesis . This , however , as we have already seen , entirely ...
... phenomena from it " * . The sweeping assertion is frequently made that the explanation of numerous facts ( i . e . of their causation ) is no proof of the truth of an hypothesis . This , however , as we have already seen , entirely ...
Página 12
... phenomena of evolution , has done his theory an injustice by comparing it with the undulatory theory of light * , seeing that he has never assumed the existence of an unknown cause or agent ; he has only extended the effect of known ...
... phenomena of evolution , has done his theory an injustice by comparing it with the undulatory theory of light * , seeing that he has never assumed the existence of an unknown cause or agent ; he has only extended the effect of known ...
Página 18
... phenomenon than the production of mere structureless material capable of undergoing organization . Indeed we may confidently anticipate that such material will eventually be formed , just as sugar , alcohol , vale- rianic acid , and a ...
... phenomenon than the production of mere structureless material capable of undergoing organization . Indeed we may confidently anticipate that such material will eventually be formed , just as sugar , alcohol , vale- rianic acid , and a ...
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Términos y frases comunes
acquired action acts adapted æther already seen Amoeba amongst amphibian ancestors ancient appears aquatic beauty become believe birds bones buds changes CHAPTER characters Chironectes complex considerable correlated Crustacea Darwin deposits descendants direct embryo energy evidence evidence of evolution evolution excreted existence external extinct extremely facts favour fish Foraminifera formation fossils gemmules genera give rise gradually hence higher highly developed Hipparion hypothesis increase individual influence inheritance lancelet large number larvæ laws less light living lower forms mammalia mammals material matter maturity modification natural selection nitrogen nourishment nutrition occur offspring organs Origin of Species ovum Pangenesis parent patagium penguins period phenomena plasticity Plate probably produce protoplasm pseudopodia race relation reproduction reptiles reptilian result rudimentary Sirenia skull specialized sternum strata structure structureless suppose survival tendency tertiary theory tion tissue transitional forms undergo undoubtedly variability variation vary vast number vertebrates vibrations volition whilst wings young
Pasajes populares
Página 136 - I look at the geological record as a history of the world imperfectly kept, and written in a changing dialect; of this history we possess the last volume alone, relating only to two or three countries. Of this volume, only here and there a short chapter has been preserved ; and of each page, only here and there a few lines.
Página 120 - Whilst at work I seemed to myself to have been endeavouring to decipher a palimpsest, and one not erased and written upon again just once, but five or six times over. " Having erased, as it were, the characters of the culminating type — those of the gaudy Indian bird — I seemed to be amongst the sombre grouse ; and then, towards incubation, the characters of the sand-grouse and hemipod stood out before me. Rubbing these away, in my downward work the form of the tinamou looked me in the face ;...
Página 148 - ... yet it is not improbable that there is a certain amount of interference between the development of free intelligence and of instinct — which latter implies some inherited modification of the brain. Little is known about the functions of the brain, but we can perceive that as the intellectual powers become highly developed, the various parts of the brain must be connected by very intricate channels of the freest intercommunication; and as a consequence, each separate part would perhaps tend...
Página 109 - As natural selection acts solely by the preservation of profitable modifications, each new form will tend in a fully-stocked country to take the place of, and finally to exterminate, its own less improved parent-form and other less-favoured forms with which it comes into competition.
Página 140 - At some future period, not very distant as measured by centuries, the civilized races of man will almost certainly exterminate and replace throughout the world the savage races.
Página 49 - If strange and rare deviations of structure are really inherited, less strange and commoner deviations may be freely admitted to be inheritable. Perhaps the correct way of viewing the whole subject would be, to look at the inheritance of every character whatever as the rule, and non-inheritance as the anomaly.
Página 33 - 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.