On the Genesis of Species

5th edit action of Natural acts admit affinity Animals and Plants annelids apes appear assertion atoms believe BIRD OF PARADISE birds body bones brought forward butterflies cause Cetacea chapter color complete conceivable conception considerable contended creation creatures Crustacea Darwin Darwinian Darwinian theory degree difficulty direct distinct evidence evolution evolved existence explain external facts favor fishes force fortuitous gemmules habits harmony Herbert Spencer homology Huxley Ibid ICHTHYOSAURUS indefinite individual innate power insects instances internal intuitions kind laws less limbs machairodus mammals manifestation marsupial matter means minute mode modifications moral Natural Selection objections observes Origin of Species Pangenesis peculiar phenomena Plants under Domestication PLESIOSAURUS possessed present preserved principle priori probably produced Prof pterodactyls race reason regard remarkable reptiles resemblance result says seems serial homology sexual selection Silurian similar structure supposed tend tendency theism theory of Natural tion true Ungulata variations vertebrate Wallace wing