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 211
... continuous area , are generally distributed in such a manner that each has a wide range , with a compara- tively narrow neutral territory between them , in which they become rather suddenly rarer and rarer ; then , as varieties do not ...
... continuous area , are generally distributed in such a manner that each has a wide range , with a compara- tively narrow neutral territory between them , in which they become rather suddenly rarer and rarer ; then , as varieties do not ...
Page 214
... continuous must often have existed within the recent period as isolated portions , in which many forms , more especially amongst the classes which unite for each birth and wander much , may have separately been rendered sufficiently ...
... continuous must often have existed within the recent period as isolated portions , in which many forms , more especially amongst the classes which unite for each birth and wander much , may have separately been rendered sufficiently ...
Page 257
... continuous area , must often have been formed when the area was not con- tinuous , and when the conditions of life did not insen- sibly graduate away from one part to another . When two varieties are formed in two districts of a continuous ...
... continuous area , must often have been formed when the area was not con- tinuous , and when the conditions of life did not insen- sibly graduate away from one part to another . When two varieties are formed in two districts of a continuous ...
Page 48
... continuous area with graduated phys- ical conditions . I endeavoured to show , that the life of each species depends in a more important manner on the presence of other already defined organic forms , than on climate , and , therefore ...
... continuous area with graduated phys- ical conditions . I endeavoured to show , that the life of each species depends in a more important manner on the presence of other already defined organic forms , than on climate , and , therefore ...
Page 68
... continuously ac- cumulating during a long period , sufficient for the slow process of modification ; hence the deposit must be a very thick one ; and the species undergoing change must have lived in the same district throughout the ...
... continuously ac- cumulating during a long period , sufficient for the slow process of modification ; hence the deposit must be a very thick one ; and the species undergoing change must have lived in the same district throughout the ...
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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