The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for Life |
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Page 11
... eggs . Many exotic plants have pollen utterly worthless , in the same con- dition as in the most sterile hybrids . When , on the one hand , we see domesticated animals and plants , though often weak and sickly , breeding freely under ...
... eggs . Many exotic plants have pollen utterly worthless , in the same con- dition as in the most sterile hybrids . When , on the one hand , we see domesticated animals and plants , though often weak and sickly , breeding freely under ...
Page 25
... state of the down with which the nestling birds are clothed when hatched . The shape and size of the eggs vary . The manner of flight , and in some breeds the voice and disposition , differ remarkably . CHAP . I. ] 25 DOMESTIC PIGEONS .
... state of the down with which the nestling birds are clothed when hatched . The shape and size of the eggs vary . The manner of flight , and in some breeds the voice and disposition , differ remarkably . CHAP . I. ] 25 DOMESTIC PIGEONS .
Page 77
... thus constantly destroying life ; or we forget how largely these songsters , or their eggs , or their nestlings , are destroyed by birds and beasts . Į of prey ; we do not always bear in mind CHAP . III . ] 77 STRUGGLE FOR EXISTENCE .
... thus constantly destroying life ; or we forget how largely these songsters , or their eggs , or their nestlings , are destroyed by birds and beasts . Į of prey ; we do not always bear in mind CHAP . III . ] 77 STRUGGLE FOR EXISTENCE .
Page 79
... eggs or seeds , must suffer destruction during some period of its life , and during some season or oc- casional year , otherwise , on the principle of geometri- cal increase , its numbers would quickly become so in- ordinately great ...
... eggs or seeds , must suffer destruction during some period of its life , and during some season or oc- casional year , otherwise , on the principle of geometri- cal increase , its numbers would quickly become so in- ordinately great ...
Page 81
... eggs and the ostrich a score , and yet in the same country the condor may be the more numerous of the two ; the Fulmar petrel lays but one egg , yet it is believed to be the most numerous bird in the world . One fly deposits hundreds of ...
... eggs and the ostrich a score , and yet in the same country the condor may be the more numerous of the two ; the Fulmar petrel lays but one egg , yet it is believed to be the most numerous bird in the world . One fly deposits hundreds of ...
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Common terms and phrases
adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young