The origin of species by means of natural selectionРипол Классик, 1929 - 454 páginas |
Dentro del libro
Resultados 1-5 de 92
Página 4
... individuals of each species are born than can possibly survive; and as, consequently, there is a frequently recurring struggle for existence, it follows that any being, if it vary however slightly in any manner profitable to itself ...
... individuals of each species are born than can possibly survive; and as, consequently, there is a frequently recurring struggle for existence, it follows that any being, if it vary however slightly in any manner profitable to itself ...
Página 7
... individuals of the same variety or sub-variety of our older cultivated plants and animals, one of the first points which strikes us is, that they enerally diifer more from each other than do the individuals of any one Species or variety ...
... individuals of the same variety or sub-variety of our older cultivated plants and animals, one of the first points which strikes us is, that they enerally diifer more from each other than do the individuals of any one Species or variety ...
Página 9
... individuals, though taken youn from a state of nature, rfectly tamed, long-lived, an healthy (of which I coullde give numerous instances), yet having their reproductive system so seriously affected by unperceived causes as to fail in ...
... individuals, though taken youn from a state of nature, rfectly tamed, long-lived, an healthy (of which I coullde give numerous instances), yet having their reproductive system so seriously affected by unperceived causes as to fail in ...
Página 10
... individuals exposed to certain conditions are affected in the same way, the change at first appears to be directly due to such conditions ; but in some cases it can be shown that quite opposite conditions produce similar changes of ...
... individuals exposed to certain conditions are affected in the same way, the change at first appears to be directly due to such conditions ; but in some cases it can be shown that quite opposite conditions produce similar changes of ...
Página 11
... individuals by certain vegetable poisons. Hairless dogs have imperfect teeth; long~haired and coarse~haired animals are apt to have, as is asserted, long or many horns; pigeons with feathered feet have skin between their outer toes ...
... individuals by certain vegetable poisons. Hairless dogs have imperfect teeth; long~haired and coarse~haired animals are apt to have, as is asserted, long or many horns; pigeons with feathered feet have skin between their outer toes ...
Contenido
5 | |
ON was GEOLOGICAL SUCCESSION OF ORGANIC | 155 |
GEOGRAPHICAL DISTRIBUTION | 282 |
Gnoonnmcu DISTRIBUTION Continued | 302 |
RECAPITULATION AND CONCLUSION | 415 |
41 | 449 |
Otras ediciones - Ver todas
Términos y frases comunes
action adapted advantage allied America amount ancient animals appear become believe birds breeds cause characters climate closely common considered continuous crossed descendants difl'erent distinct domestic doubt evidence existing extinct extremely facts families favourable fertility find first flowers follow formations forms genera genus give given greater groups habits hand Hence hybrids important increase individuals inhabitants inherited insects instance instincts intermediate islands kind known land laws less lines living look males manner means migration modification namely natural selection naturalists nearly never observed occur organic origin parent perfect period plants points present principle probably produced range ranked reason regions remains remarked resemble seeds seems seen separated shown single slight sometimes species sterility structure struggle successive suppose tend theory tion trees variability variations varieties vary whole widely