. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . PLATE III.—1, Oreomystis bairdii Stejneger, Kauai; 2, Heterorhynchus oliva-ceus La Fresnaye, Hawaii. 3, Drcpanis funerea Xewton, Molokai. (Fromspecimens.) GEOGRAPHIC ISOLATION AND SPECIES-FORMING 127 closely related Psittacirostra eats only fruits, that of the ieie(Freycinetia arborea) and the red mulberry (Morns sapyrifera)being especially chosen. In all these genera, there is prac-tically one species to each island, except that in some casesthe species
. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . PLATE III.—1, Oreomystis bairdii Stejneger, Kauai; 2, Heterorhynchus oliva-ceus La Fresnaye, Hawaii. 3, Drcpanis funerea Xewton, Molokai. (Fromspecimens.) GEOGRAPHIC ISOLATION AND SPECIES-FORMING 127 closely related Psittacirostra eats only fruits, that of the ieie(Freycinetia arborea) and the red mulberry (Morns sapyrifera)being especially chosen. In all these genera, there is prac-tically one species to each island, except that in some casesthe species has not spread from the mountain or island in whichwe may suppose it to have been originally developed. There are a few other song birds in the Hawaiian Islands,not related to the Drepanidae. These are derived from theislands of Polynesia and have deviated from the original typesin a degree corresponding to their isolation. In the case of theDrepanida?, it seems necessary to conclude that natural selectionis responsible for the physiological adaptations characteristicof the different genera. Such changes may be relatively rapid,and
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