On the Origin of Species by Means of Natural Selection |
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Page 14
... greater variability is simply due to our domestic produc- tions having been raised under conditions of life not so uniform as , and somewhat different from , those to which the parent - species have been exposed under nature . There is ...
... greater variability is simply due to our domestic produc- tions having been raised under conditions of life not so uniform as , and somewhat different from , those to which the parent - species have been exposed under nature . There is ...
Page 19
... greater degree , to males alone . A much more important rule , which I think may be trusted , is that , at whatever period of life peculiarity first appears , it tends to appear in the offspring at a correspond- ing age , though ...
... greater degree , to males alone . A much more important rule , which I think may be trusted , is that , at whatever period of life peculiarity first appears , it tends to appear in the offspring at a correspond- ing age , though ...
Page 20
... greater length of horn , though appearing late in life , is clearly due to the male element . Having alluded to the subject of reversion , I may here refer to a statement often made by naturalists — namely , that our domestic varieties ...
... greater length of horn , though appearing late in life , is clearly due to the male element . Having alluded to the subject of reversion , I may here refer to a statement often made by naturalists — namely , that our domestic varieties ...
Page 30
... greater number of generations . In a breed which has been crossed only once with some distinct breed , the ten- dency to reversion to any character derived from such cross will naturally become less and less , as in each suc- ceeding ...
... greater number of generations . In a breed which has been crossed only once with some distinct breed , the ten- dency to reversion to any character derived from such cross will naturally become less and less , as in each suc- ceeding ...
Page 50
... greater number rank it as an undoubted species peculiar to Great Britain . A wide distance between the homes of two doubtful forms leads many naturalists to rank both as distinct species ; but what distance , it has been well asked ...
... greater number rank it as an undoubted species peculiar to Great Britain . A wide distance between the homes of two doubtful forms leads many naturalists to rank both as distinct species ; but what distance , it has been well asked ...
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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