On the Origin of Species by Means of Natural Selection: Or The Preservation of Favoured Races in the Struggle for LifeHumphrey Milford, Oxford University Press, 1923 - 454 páginas |
Dentro del libro
Resultados 11-15 de 66
Página 163
... perfect so - called flying squirrel was produced . Now look at the Galeopithecus or flying lemur , which formerly was falsely ranked amongst bats . It has an extremely wide flank - membrane , stretching from the corners of the jaw to ...
... perfect so - called flying squirrel was produced . Now look at the Galeopithecus or flying lemur , which formerly was falsely ranked amongst bats . It has an extremely wide flank - membrane , stretching from the corners of the jaw to ...
Página 164
... perfect power of flight ; but they serve , at least , to show what diversified means of transition are possible . Seeing that a few members of such water - breathing classes as the Crustacea and Mollusca are adapted to live on the land ...
... perfect power of flight ; but they serve , at least , to show what diversified means of transition are possible . Seeing that a few members of such water - breathing classes as the Crustacea and Mollusca are adapted to live on the land ...
Página 168
... perfect and complex eye to one very imperfect and simple , each grade being useful to its possessor , can be shown to exist ; if further , the eye does vary ever so slightly , and the variations be inherited , which is certainly the ...
... perfect and complex eye to one very imperfect and simple , each grade being useful to its possessor , can be shown to exist ; if further , the eye does vary ever so slightly , and the variations be inherited , which is certainly the ...
Página 169
... perfect as is possessed by any member of the great Articulate class . He who will go thus far , if he find on finishing this treatise that large bodies of facts , otherwise inexplic- able , can be explained by the theory of descent ...
... perfect as is possessed by any member of the great Articulate class . He who will go thus far , if he find on finishing this treatise that large bodies of facts , otherwise inexplic- able , can be explained by the theory of descent ...
Página 175
... perfect and complex as the eye . In the first place , we are much too ignorant in regard to the whole economy of any one organic being , to say what slight modifications would be of importance or not . In a former chapter I have given ...
... perfect and complex as the eye . In the first place , we are much too ignorant in regard to the whole economy of any one organic being , to say what slight modifications would be of importance or not . In a former chapter I have given ...
Otras ediciones - Ver todas
On the Origin of Species by Means of Natural Selection: or the Preservation ... Charles Darwin Vista previa limitada - 2023 |
Términos y frases comunes
accumulated adapted affinities allied species America amount analogous ancient appear Archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence doubt embryo endemic Europe existing exterminated extinct extremely facts favourable fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing land larvæ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons pistil plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation vary whole widely