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 |
Dentro del libro
Resultados 1-5 de 77
Página xvi
... nearly depopulated at successive periods , and then re - stocked ; and he gives as an alternative , that new forms may be generated " without the presence of any mould or germ of former aggregates . " I am not sure that I understand ...
... nearly depopulated at successive periods , and then re - stocked ; and he gives as an alternative , that new forms may be generated " without the presence of any mould or germ of former aggregates . " I am not sure that I understand ...
Página 6
... nearly similar variations sometimes arise under , as far as we can judge , dissimilar conditions ; and , on the other hand , dissimila variations arise under conditions which appear to be nearly uniform . The effects on the offspring ...
... nearly similar variations sometimes arise under , as far as we can judge , dissimilar conditions ; and , on the other hand , dissimila variations arise under conditions which appear to be nearly uniform . The effects on the offspring ...
Página 10
... nearly mature ; peculiarities in the silk- worm are known to appear at the corresponding caterpillar or cocoon stage . But hereditary diseases and some other facts make me believe that the rule has a wider extension , and that , when ...
... nearly mature ; peculiarities in the silk- worm are known to appear at the corresponding caterpillar or cocoon stage . But hereditary diseases and some other facts make me believe that the rule has a wider extension , and that , when ...
Página 11
... nearly the same manner as the increased length of the horns in the offspring from a short - horned cow by a long - horned bull , though appearing late in life , is clearly due to the male element . Having alluded to the subject of ...
... nearly the same manner as the increased length of the horns in the offspring from a short - horned cow by a long - horned bull , though appearing late in life , is clearly due to the male element . Having alluded to the subject of ...
Página 14
... nearly all the English breeds of the fowl alive , having bred and crossed them , and examined their skeletons , it appears to me almost certain that all are the descendants of the wild Indian fowl , Gallus bankiva ; and this is the ...
... nearly all the English breeds of the fowl alive , having bred and crossed them , and examined their skeletons , it appears to me almost certain that all are the descendants of the wild Indian fowl , Gallus bankiva ; and this is the ...
Otras ediciones - Ver todas
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