The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for LifeWerner Company, Book Manufacturers, 1900 - 538페이지 |
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57 페이지
... ranking the most common , but sometimes the one first described , as the species , and the other as the variety . But cases of great difficulty , which I will not here enumerate , some- times arise in deciding whether or not to rank one ...
... ranking the most common , but sometimes the one first described , as the species , and the other as the variety . But cases of great difficulty , which I will not here enumerate , some- times arise in deciding whether or not to rank one ...
59 페이지
... ranked by naturalists as true species . Nevertheless , no certain criterion can possibly be given by which variable ... rank them as distinct species ; but what distance , it has been well asked , will suffice ; if that between America ...
... ranked by naturalists as true species . Nevertheless , no certain criterion can possibly be given by which variable ... rank them as distinct species ; but what distance , it has been well asked , will suffice ; if that between America ...
61 페이지
... rank of varie- ties . Some few naturalists maintain that animals never present varieties ; but then these same naturalists rank the slightest difference as of specific value ; and when the same identical form is met with in two distant ...
... rank of varie- ties . Some few naturalists maintain that animals never present varieties ; but then these same naturalists rank the slightest difference as of specific value ; and when the same identical form is met with in two distant ...
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adapted advantage allied 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 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 improved increase individuals 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 Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual sexual selection slight stamens structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young