The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1권D. Appleton, 1898 |
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viii 페이지
... cell - making instinct - Changes of instinct and structure not necessarily simultaneous - Difficulties of the theory of the Natural Selection of instincts - Neuter or sterile insects Summary . Page 319 ADDITIONS AND CORRECTIONS TO THE ...
... cell - making instinct - Changes of instinct and structure not necessarily simultaneous - Difficulties of the theory of the Natural Selection of instincts - Neuter or sterile insects Summary . Page 319 ADDITIONS AND CORRECTIONS TO THE ...
155 페이지
... or division to be compounded of several cells , or became attached to any supporting surface , his law " that homologous units of any order become differentiated in proportion as. CHAP . IV . ] ORGANISATION TENDS TO ADVANCE 155.
... or division to be compounded of several cells , or became attached to any supporting surface , his law " that homologous units of any order become differentiated in proportion as. CHAP . IV . ] ORGANISATION TENDS TO ADVANCE 155.
208 페이지
... cells , and which has practically anticipated the discoveries of profound mathematicians ? Fourthly , how can we account for species , when crossed , being sterile and producing sterile offspring , ' whereas , when varieties are crossed ...
... cells , and which has practically anticipated the discoveries of profound mathematicians ? Fourthly , how can we account for species , when crossed , being sterile and producing sterile offspring , ' whereas , when varieties are crossed ...
225 페이지
... cells and covered by translucent skin , but without any lens or other refractive body . We may , however , according to M. Jourdain , descend even a step lower and find aggregates of pigment - cells , apparently serving as organs of ...
... cells and covered by translucent skin , but without any lens or other refractive body . We may , however , according to M. Jourdain , descend even a step lower and find aggregates of pigment - cells , apparently serving as organs of ...
227 페이지
... cells , lying in a sack - like fold of the skin ; and the vitreous body is formed from embry- onic sub - cutaneous tissue . To arrive , however , at a just conclusion regarding the formation of the eye , with all its marvellous yet not ...
... cells , lying in a sack - like fold of the skin ; and the vitreous body is formed from embry- onic sub - cutaneous tissue . To arrive , however , at a just conclusion regarding the formation of the eye , with all its marvellous yet not ...
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adapted advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree descendants developed difficulty distinct species disuse divergence domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important increase inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less males manner Melipona Mivart modified natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species parent perfect period pigeons pollen pollen-grains present preserved prey principle probably produced progenitor quadrupeds rank rarely Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young