On the Origin of Species by Means of Natural Selection |
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Page v
... seems to have been chiefly led to this conclusion by the difficulty of dis- tinguishing species and varieties , by the almost perfect gradation of the forms in certain groups , and by the anal- ogy of domestic productions . With respect ...
... seems to have been chiefly led to this conclusion by the difficulty of dis- tinguishing species and varieties , by the almost perfect gradation of the forms in certain groups , and by the anal- ogy of domestic productions . With respect ...
Page vi
... seems to attribute all the beautiful adaptations in nature , -such as the long neck of the giraffe for browsing on the branches of trees . * But he likewise believed in a law of progressive develop- ment ; and as all the forms of life ...
... seems to attribute all the beautiful adaptations in nature , -such as the long neck of the giraffe for browsing on the branches of trees . * But he likewise believed in a law of progressive develop- ment ; and as all the forms of life ...
Page vii
... seems to me to lean towards the side of change . The Vestiges of Creation appeared in 1844. In the last or tenth and much improved edition ( 1853 , p . 155 ) , the anonymous author says : " The proposition determined on after much ...
... seems to me to lean towards the side of change . The Vestiges of Creation appeared in 1844. In the last or tenth and much improved edition ( 1853 , p . 155 ) , the anonymous author says : " The proposition determined on after much ...
Page 14
... seems pretty clear that organic beings must be exposed during several generations to the new conditions of life to cause any ap- preciable amount of variation ; and that when the organ- isation has once begun to vary , it generally ...
... seems pretty clear that organic beings must be exposed during several generations to the new conditions of life to cause any ap- preciable amount of variation ; and that when the organ- isation has once begun to vary , it generally ...
Page 18
... seems to have become plastic , and tends to depart in some small degree from that of the parental type . Any variation which is not inheritable is unimportant for us . But the number and diversity of inheritable de viations of structure ...
... seems to have become plastic , and tends to depart in some small degree from that of the parental type . Any variation which is not inheritable is unimportant for us . But the number and diversity of inheritable de viations of structure ...
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Common terms and phrases
accumulated adapted affinities allied species America amount ancient animals appear 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 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 intermediate land larvæ laws less living look male mammals manner migration modification modified descendants natural selection naturalists nearly nest offspring organic organisation perfect pigeons pistil plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rudimentary seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation varieties vary whole widely