On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430 páginas |
Dentro del libro
Resultados 1-5 de 100
Página 15
... follows from the high geometrical ratio of their increase , will be treated of . This is the doctrine of Malthus , applied to the whole animal and vegetable kingdoms . As many more individuals of each species are INTRODUCTION 15.
... follows from the high geometrical ratio of their increase , will be treated of . This is the doctrine of Malthus , applied to the whole animal and vegetable kingdoms . As many more individuals of each species are INTRODUCTION 15.
Página 16
... whole work , and a few concluding remarks . No one ought to feel surprise at much remaining as yet unexplained in regard to the origin of species and varieties , if he make due allowance for our profound ignorance in regard to the ...
... whole work , and a few concluding remarks . No one ought to feel surprise at much remaining as yet unexplained in regard to the origin of species and varieties , if he make due allowance for our profound ignorance in regard to the ...
Página 22
... whole skeleton , than do the same bones in the wild - duck ; and I presume that this change may be safely attributed to the domestic duck flying much less , and walking more , than its wild parent . The great and inherited development ...
... whole skeleton , than do the same bones in the wild - duck ; and I presume that this change may be safely attributed to the domestic duck flying much less , and walking more , than its wild parent . The great and inherited development ...
Página 23
... whole organisation seems to have become plastic , and tends to depart in some small degree from that of the parental type . [ Any variation which is not inherited is unimporta for us . But the number and diversity of inheritable ...
... whole organisation seems to have become plastic , and tends to depart in some small degree from that of the parental type . [ Any variation which is not inherited is unimporta for us . But the number and diversity of inheritable ...
Página 24
... whole subject , would be , to look at the inheritance of every character whatever as the rule , and non - inheritance as the anomaly . The laws governing inheritance are quite unknown ; no one can say why a peculiarity in different ...
... whole subject , would be , to look at the inheritance of every character whatever as the rule , and non - inheritance as the anomaly . The laws governing inheritance are quite unknown ; no one can say why a peculiarity in different ...
Otras ediciones - Ver todas
Términos y frases comunes
accumulated adapted affinities allied species America analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo endemic existing exterminated extinct extremely facts favourable fertilised fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely