The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432페이지 |
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29개의 결과 중 6 - 10개
141 페이지
... families , and which are situated in different parts of the body , offer , under our present state of ignorance , a difficulty almost exactly parallel with that of the electric organs . Other similar cases could be given ; for instance ...
... families , and which are situated in different parts of the body , offer , under our present state of ignorance , a difficulty almost exactly parallel with that of the electric organs . Other similar cases could be given ; for instance ...
142 페이지
... families of crustaceans include a few species , possessing an air - breathing apparatus and fitted to live out of the water . In two of these families , which were more especially examined by Müller , and which are nearly related to ...
... families of crustaceans include a few species , possessing an air - breathing apparatus and fitted to live out of the water . In two of these families , which were more especially examined by Müller , and which are nearly related to ...
143 페이지
... families which live on the land , the equally - important air - breathing appa- ratus would have been the same ; for why should this one apparatus , given for the same purpose , have been made to differ , whilst all the other important ...
... families which live on the land , the equally - important air - breathing appa- ratus would have been the same ; for why should this one apparatus , given for the same purpose , have been made to differ , whilst all the other important ...
159 페이지
... families of plants differ chiefly from each other in mor- phological characters , which appear to be quite unimportant for the welfare of the species . He consequently believes in an innate tendency towards progressive and more perfect ...
... families of plants differ chiefly from each other in mor- phological characters , which appear to be quite unimportant for the welfare of the species . He consequently believes in an innate tendency towards progressive and more perfect ...
184 페이지
... families of plants , single species and single genera possess the power of revolving , and have thus become twiners , they must have independently acquired it , and cannot have inherited it from a common progenitor . Hence I was led to ...
... families of plants , single species and single genera possess the power of revolving , and have thus become twiners , they must have independently acquired it , and cannot have inherited it from a common progenitor . Hence I was led to ...
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accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely facts favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young