On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeHeritage Press, 1963 - 470페이지 |
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320 페이지
... embryo , owing to variations having supervened at a not early age , and having been inherited at a corresponding age . This process , whilst it leaves the embryo almost unaltered , continually adds , in the course of successive ...
... embryo , owing to variations having supervened at a not early age , and having been inherited at a corresponding age . This process , whilst it leaves the embryo almost unaltered , continually adds , in the course of successive ...
405 페이지
... embryo and the adult ; —the various parts in the same individual embryo , which ultimately become very unlike and serve for diverse purposes , being at an early period of growth alike ; —the common , but not invariable , resemblance ...
... embryo and the adult ; —the various parts in the same individual embryo , which ultimately become very unlike and serve for diverse purposes , being at an early period of growth alike ; —the common , but not invariable , resemblance ...
450 페이지
... EMBRYO . — The young animal undergoing development within the egg or womb . — EMBRYOLOGY . — The study of the development of the embryo . ENDEMIC . - Peculiar to a given locality . ENTOMOSTRACA . - A division of the class Crustacea ...
... EMBRYO . — The young animal undergoing development within the egg or womb . — EMBRYOLOGY . — The study of the development of the embryo . ENDEMIC . - Peculiar to a given locality . ENTOMOSTRACA . - A division of the class Crustacea ...
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accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters cirripedes climate closely allied colour common progenitor continuous crossed crustaceans degree developed difficulty distinct species divergence doubt effects eggs embryo existing exterminated extinct extremely fact favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gradations greater number habits Hence hybrids hybrids produced 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 offspring organisation organs parent peculiar perfect pigeons pistil plants pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection slight South America stamens sterility structure successive supposed swimbladder theory variability variations varieties vary whilst whole widely different wings young