On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for Life |
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Page 29
... believe that animals closely resembling the Italian greyhound , the bloodhound , the bull - dog , pug - dog , or Blenheim spaniel , & c . - so unlike all wild Canidæ - ever existed freely in a state of nature ? It has often been loosely ...
... believe that animals closely resembling the Italian greyhound , the bloodhound , the bull - dog , pug - dog , or Blenheim spaniel , & c . - so unlike all wild Canidæ - ever existed freely in a state of nature ? It has often been loosely ...
Page 31
... believe that any ornithologist would place the English carrier , the short - faced tumbler , the runt , the barb , pouter , and fantail in the same genus ; more es- pecially as in each of these breeds several truly - inherited sub ...
... believe that any ornithologist would place the English carrier , the short - faced tumbler , the runt , the barb , pouter , and fantail in the same genus ; more es- pecially as in each of these breeds several truly - inherited sub ...
Page 34
... believe that long- continued domestication eliminates this strong tendency to sterility : from the history of the dog I think there is some probability in this hypothesis , if applied to species closely related together , though it is ...
... believe that long- continued domestication eliminates this strong tendency to sterility : from the history of the dog I think there is some probability in this hypothesis , if applied to species closely related together , though it is ...
Page 52
... believe that many of these doubtful and closely - allied forms have permanently retained their characters in their own country for a long time ; for as long , as far as we know , as have good and true species . Practically , when a ...
... believe that many of these doubtful and closely - allied forms have permanently retained their characters in their own country for a long time ; for as long , as far as we know , as have good and true species . Practically , when a ...
Page 53
... naturalists rank the slightest differences as of specific value ; and when even the same identical form is met with in two distant countries , or in two quite distinct geological formations , they go so far as to believe DOUBTFUL SPECIES ...
... naturalists rank the slightest differences as of specific value ; and when even the same identical form is met with in two distant countries , or in two quite distinct geological formations , they go so far as to believe DOUBTFUL SPECIES ...
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Common terms and phrases
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