The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for Life, Том 1

adapted advantage allied ants aphides appear Asa Gray avicularia beak become bees believe birds breeds caudicle cause cells characters cies climate closely color common crossed cuckoo degree descendants developed difficulty distinct species disuse divergence domestic animals domestic races doubt effects eggs exist extinct extremely facts favorable females fertile flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important increase individuals inhabitants inherited insects instance instinct intercrossing intermediate kind lamellæ lancelet large number larvæ lection less males manner Melipona Mivart modified natural selection naturalists nearly nest offspring organs perfect period pigeon plants pollen pollen-grains present prey principle probably produced progenitor quadrupeds rank rarely remarked resemble rieties rock-pigeon seeds sexes sexual sexual selection slight sometimes stamens striped structure struggle supposed swimbladder tend tendency tinct tion transitional trees variability variations varieties vary widely wings young