The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, Volumen1D. Appleton, 1898 |
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Página vii
... highly variable ; specific characters more variable than generic : secondary sexual characters variable - Species of the same genus vary in an analogous manner - Reversions to long - lost characters - Summary . Page 164 CHAPTER VI ...
... highly variable ; specific characters more variable than generic : secondary sexual characters variable - Species of the same genus vary in an analogous manner - Reversions to long - lost characters - Summary . Page 164 CHAPTER VI ...
Página xvii
... highly plastic condition , and that these have produced , chiefly by intercrossing , but likewise by variation , all our existing species . In 1826 Professor Grant , in the concluding para- graph in his well - known paper ( Edinburgh ...
... highly plastic condition , and that these have produced , chiefly by intercrossing , but likewise by variation , all our existing species . In 1826 Professor Grant , in the concluding para- graph in his well - known paper ( Edinburgh ...
Página 5
... highly developed being or into an elab- orately constructed organ ; secondly , the subject of In- stinct , or the mental powers of animals ; thirdly , Hybrid- ism , or the infertility of species and the fertility of varieties when ...
... highly developed being or into an elab- orately constructed organ ; secondly , the subject of In- stinct , or the mental powers of animals ; thirdly , Hybrid- ism , or the infertility of species and the fertility of varieties when ...
Página 25
... highly remarkable manner . The caudal and sacral vertebræ vary in number ; as does the number of the ribs , together with their relative breadth and the pre- sence of processes . The size and shape of the apertures in the sternum are highly ...
... highly remarkable manner . The caudal and sacral vertebræ vary in number ; as does the number of the ribs , together with their relative breadth and the pre- sence of processes . The size and shape of the apertures in the sternum are highly ...
Página 27
... above - specified breeds , though agreeing generally with the wild rock - pigeon in constitution , habits , voice , colouring , and in most parts of their structure , yet are certainly highly abnor-. CHAP . I. ] 27 DOMESTIC PIGEONS .
... above - specified breeds , though agreeing generally with the wild rock - pigeon in constitution , habits , voice , colouring , and in most parts of their structure , yet are certainly highly abnor-. CHAP . I. ] 27 DOMESTIC PIGEONS .
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Términos y frases comunes
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