The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, Volumen1AMS Press, 1972 - 479 páginas This is a reproduction of the original artefact. Generally these books are created from careful scans of the original. This allows us to preserve the book accurately and present it in the way the author intended. Since the original versions are generally quite old, there may occasionally be certain imperfections within these reproductions. We're happy to make these classics available again for future generations to enjoy! |
Dentro del libro
Resultados 1-3 de 59
Página 87
... effects of close interbreeding , no doubt come into play in many of these cases ; but I will not here enlarge on ... effect on the insects must have been still greater , for six insectivorous birds were very common in the plantations ...
... effects of close interbreeding , no doubt come into play in many of these cases ; but I will not here enlarge on ... effect on the insects must have been still greater , for six insectivorous birds were very common in the plantations ...
Página 167
... effects of long- continued use or disuse , for we know not the parent- forms ; but many animals possess structures which can be best explained by the effects of disuse . As Professor Owen has remarked , there is no greater anomaly in ...
... effects of long- continued use or disuse , for we know not the parent- forms ; but many animals possess structures which can be best explained by the effects of disuse . As Professor Owen has remarked , there is no greater anomaly in ...
Página 168
... effects of operations , should make us cautious in denying this tendency . Hence it will perhaps be safest to look at the entire absence of the anterior tarsi in Ateuchus , and their rudimentary condition in some other genera , not as ...
... effects of operations , should make us cautious in denying this tendency . Hence it will perhaps be safest to look at the entire absence of the anterior tarsi in Ateuchus , and their rudimentary condition in some other genera , not as ...
Contenido
CHAPTER I | 5 |
VARIATION UNDER NATURE | 51 |
Its bearing on natural selectionThe term used in a wide sense | 75 |
Derechos de autor | |
Otras 5 secciones no mostradas
Términos y frases comunes
acquired adapted advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree developed difficulty distinct species disuse domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important improved increase in number individual differences inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less likewise males manner Melipona Mivart natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species perfect period pigeons pollen pollen-grains present preserved principle probably produced progenitor quadrupeds rank Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion transitional tree variability variations varieties vary widely wings young