Humboldt Library of Popular Science Literature, Volume 1

abundant adapted allied Amphibia animals appear Arctic Australia Bats biological birds body branches Carnivora cause Cetacea character Charles Darwin classification conception continent creation Crustacea Cuvier Darwinian descent distinct distribution doctrine Eocene epoch Erasmus Erasmus Darwin Europe evidence evolution evolutionary evolutionism existence extinct fact fauna fishes flora Foraminifera forms fossil genera genus geological gradually groups human HUMBOLDT hypothesis ical idea important insects instinct islands knowledge Lamarck land larvæ less living Lyell Mammalia mammals Marsupials ment Mesozoic mind Miocene modification natural selection naturalist North observed ocean organic Origin of Species Palearctic period phenomena philosophical phosphorescence physical plants possess present principle progress region relations remarkable reptiles scientific South America structure sub-region supposed surface theory things tion tropical true truth types Ungulata universe vegetation whole Zoology