On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, 2권D. Appleton, 1888 - 458페이지 |
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ii 페이지
... Observations on their Habits . With Il- trations . 12mo . Cloth , $ 1.50 . For sale by all booksellers ; or sent by mail , post - paid , on receipt of price . New York : D. APPLETON & CO . , 1 , 3 , & 5 Bond Street . ON THE ORIGIN OF ...
... Observations on their Habits . With Il- trations . 12mo . Cloth , $ 1.50 . For sale by all booksellers ; or sent by mail , post - paid , on receipt of price . New York : D. APPLETON & CO . , 1 , 3 , & 5 Bond Street . ON THE ORIGIN OF ...
xix 페이지
... observation des animaux sauvages démontre déjà la variabilité limitée des espèces . Les expériences sur les animaux sauvages devenus domestiques , et sur les animaux domestiques redevenus sauvages , la démontrent plus clairement encore ...
... observation des animaux sauvages démontre déjà la variabilité limitée des espèces . Les expériences sur les animaux sauvages devenus domestiques , et sur les animaux domestiques redevenus sauvages , la démontrent plus clairement encore ...
xxi 페이지
... observations . The first edition of this work was published on November 24th , 1859 , and the second edition on January 7th , 1860 . ORIGIN OF SPECIES . INTRODUCTION . WHEN on board H.M.S. Historical Sketch . xxi ziii-xxI.
... observations . The first edition of this work was published on November 24th , 1859 , and the second edition on January 7th , 1860 . ORIGIN OF SPECIES . INTRODUCTION . WHEN on board H.M.S. Historical Sketch . xxi ziii-xxI.
3 페이지
... observations it seemed to me probable that a careful study of domesticated animals and of cultivated plants would offer the best chance of making out this obscure problem . Nor have I been disappointed ; in this and in all other ...
... observations it seemed to me probable that a careful study of domesticated animals and of cultivated plants would offer the best chance of making out this obscure problem . Nor have I been disappointed ; in this and in all other ...
7 페이지
... observed with plants and animals when reared under new or unnatural conditions Many facts clearly show how eminently susceptible the reproduc tive system is to very slight changes in the surrounding conditions . Nothing is more easy ...
... observed with plants and animals when reared under new or unnatural conditions Many facts clearly show how eminently susceptible the reproduc tive system is to very slight changes in the surrounding conditions . Nothing is more easy ...
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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 continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number 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 reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed tend theory tion variability variations varieties vary whilst whole wings young