On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430페이지 |
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10 페이지
... land , and by occasional means - Dispersal during the Glacial period co - extensive with the world .. 300 CHAPTER XII GEOGRAPHICAL DISTRIBUTION - continued Distribution of fresh - water productions - On the inhabitants of oceanic ...
... land , and by occasional means - Dispersal during the Glacial period co - extensive with the world .. 300 CHAPTER XII GEOGRAPHICAL DISTRIBUTION - continued Distribution of fresh - water productions - On the inhabitants of oceanic ...
37 페이지
... land or mountain pasture , with the wool of " one breed good for one purpose , and that of another breed for another purpose ; when we compare the many breeds of dogs , each good for man in very different ways ; when we compare the game ...
... land or mountain pasture , with the wool of " one breed good for one purpose , and that of another breed for another purpose ; when we compare the many breeds of dogs , each good for man in very different ways ; when we compare the game ...
46 페이지
... land plays a part . Wandering savages or the inhabitants of open plains rarely possess more than one breed of the same species . Pigeons can be 1 mated for life , and this is a great convenience 46 VARIATION UNDER DOMESTICATION.
... land plays a part . Wandering savages or the inhabitants of open plains rarely possess more than one breed of the same species . Pigeons can be 1 mated for life , and this is a great convenience 46 VARIATION UNDER DOMESTICATION.
56 페이지
... land - shells in Madeira . If a variety were to flourish so as to exceed in numbers the parent species , it would then rank as the species , and the species as the variety ; or it might come to supplant and exterminate the parent ...
... land - shells in Madeira . If a variety were to flourish so as to exceed in numbers the parent species , it would then rank as the species , and the species as the variety ; or it might come to supplant and exterminate the parent ...
72 페이지
... land had been enclosed , so that cattle could not enter . But how important an element enclosure is , I plainly saw near Farnham , in Surrey . Here there are extensive heaths , with a few clumps of old Scotch firs on the distant hill ...
... land had been enclosed , so that cattle could not enter . But how important an element enclosure is , I plainly saw near Farnham , in Surrey . Here there are extensive heaths , with a few clumps of old Scotch firs on the distant hill ...
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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