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adaptation adaptive radiation adult America amphibia ancestral animals ants appearance aquatic aquatic adaptation arboreal become benthos birds body bone carnivorous cause cave cells Chapter characteristics characters colony color comparable creatures Cretaceous Darwin digits dinosaurs elephants entire Eocene epigean evolution evolutionary existence extinct factor fauna feet female fins fishes flying forms fossil fossorial function genera genus geologic germ-plasm gills habitat hand hence heredity hind limbs horse ichthyosaurs increase individual inheritance insects instance jaws Kellogg known larva later light living lizards male mammals marine marsupials Mesozoic migration Miocene modification molluscs muscles natural selection normal notochord occur offspring organs origin Orthogenesis pair Paleozoic parasitic patagium Permian plants primitive produced protoplasm Protozoa race realm reproduction reptiles result sedentary sexual shell skeleton species structure surface tail teeth terrestrial theory tion trees Triassic true types variation vertebrates whales wings young
Page 151 - And he set the rods which he had pilled before the flocks in the gutters in the watering troughs when the flocks came to drink, that they should conceive when they came to drink.
Page 27 - Hence it appears to be a matter of no great moment what animal, or what plant, I lay under contribution for protoplasm, and the fact speaks volumes for the general identity of that substance in all living beings.
Page 10 - Lamarck (1744-1829) was one of the most remarkable as well as one of the most pathetic figures in evolutionary history.
Page 27 - ... of California, towering to the dimensions of a cathedral spire, or the Indian fig, which covers acres with its profound shadow, and endures while nations and empires come and go around its vast circumference. Or, turning to the other half of the world of life, picture to...
Page 660 - The structural differences between Man and the Man-like apes certainly justify our regarding him as constituting a family apart from them ; though, inasmuch as he differs less from them than they do from other families of the same order, there can be no justification for placing him in a distinct order.
Page 661 - Perhaps no order of mammals presents us with so extraordinary a series of gradations as this— leading us insensibly from the crown and summit of the animal creation down to creatures, from which there is but a step, as it seems, to the lowest, smallest, and least intelligent of the placcntal Mammalia.
Page 9 - ... all animals undergo perpetual transformations; which are in part produced by their own exertions in consequence of their desires and aversions, of their pleasures and their pains, or of irritations, or of associations; and many of these acquired forms or propensities are transmitted to their posterity.
Page 165 - Fourth law.— All that has been acquired or altered in the organization of individuals during their life is preserved by generation, and transmitted to new individuals which proceed from those which have undergone these changes.