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 1-5 de 75
Página 2
... point is discussed in this volume on which facts cannot be adduced , often apparently leading to conclusions directly opposite to those at which I have arrived . A fair result can be obtained only by fully stating and balancing the ...
... point is discussed in this volume on which facts cannot be adduced , often apparently leading to conclusions directly opposite to those at which I have arrived . A fair result can be obtained only by fully stating and balancing the ...
Página 7
... points which strikes us is , that they generally differ more from each other than do the individuals of any one species or variety in a state of nature . When we reflect on the vast diversity of the plants and animals which have been ...
... points which strikes us is , that they generally differ more from each other than do the individuals of any one species or variety in a state of nature . When we reflect on the vast diversity of the plants and animals which have been ...
Página 10
... point of view , Mr. Buckman's recent experiments on plants are extremely valuable . When all or nearly all the individuals exposed to certain conditions are affected in the same way , the change at first appears to be directly due to ...
... point of view , Mr. Buckman's recent experiments on plants are extremely valuable . When all or nearly all the individuals exposed to certain conditions are affected in the same way , the change at first appears to be directly due to ...
Página 12
... points in structure and constitution in which the varieties and sub - varieties differ slightly from each other . The whole organisation seems to have become plastic , and tends to depart in some small degree from that of the parental ...
... points in structure and constitution in which the varieties and sub - varieties differ slightly from each other . The whole organisation seems to have become plastic , and tends to depart in some small degree from that of the parental ...
Página 15
... several parent species . This point , if it could be cleared up , would be interesting ; if , for instance , it could be shown that the greyhound , bloodhound , terrier , spaniel , and bull - dog , which VARIATION UNDER DOMESTICATION 15.
... several parent species . This point , if it could be cleared up , would be interesting ; if , for instance , it could be shown that the greyhound , bloodhound , terrier , spaniel , and bull - dog , which VARIATION UNDER DOMESTICATION 15.
Otras ediciones - Ver todas
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