On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, Volumen2D. Appleton, 1888 - 458 páginas |
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Página v
... Varieties -Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one or more Species- Domestic Pigeons , their Differences and Origin - Principles of Selection , anciently fol- lowed , their ...
... Varieties -Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one or more Species- Domestic Pigeons , their Differences and Origin - Principles of Selection , anciently fol- lowed , their ...
Página viii
... varieties at the present day - On the nature of extinct intermediate varieties ; on their number - OD the lapse of time , as inferred from the rate of denudation and of deposition On the lapse of time as estimated by years - On the ...
... varieties at the present day - On the nature of extinct intermediate varieties ; on their number - OD the lapse of time , as inferred from the rate of denudation and of deposition On the lapse of time as estimated by years - On the ...
Página xv
... varieties of mankind , fitted for the country which they inhabit . Of the acci- dental varieties of man , which would occur among the first few and scattered inhabitants of the middle regions of Africa , some one would be better fitted ...
... varieties of mankind , fitted for the country which they inhabit . Of the acci- dental varieties of man , which would occur among the first few and scattered inhabitants of the middle regions of Africa , some one would be better fitted ...
Página xvi
... varieties once , and many varieties are gradually becoming species by assuming constant and peculiar characters ; " but farther on ( p . 18 ) he adds , " except the original types or ancestors of the genus . " In 1843-44 Professor Ha ...
... varieties once , and many varieties are gradually becoming species by assuming constant and peculiar characters ; " but farther on ( p . 18 ) he adds , " except the original types or ancestors of the genus . " In 1843-44 Professor Ha ...
Página xix
... varieties , and from the principle of general gradation , that species have been modified ; and he attributes the modification to the change of circumstances . The author ( 1855 ) has also treated Psychology on the principle of the ...
... varieties , and from the principle of general gradation , that species have been modified ; and he attributes the modification to the change of circumstances . The author ( 1855 ) has also treated Psychology on the principle of the ...
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Términos y frases comunes
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