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actions and reactions adaptive radiation algae American Museum amphibians ancestral Anchisaurus appear aquatic arboreal armature armored atmosphere author by W. K. bacteria birds body form calcium Cambrian carbon carnivorous cell changes characters chemical elements chemical messengers chlorophyll chromatin colloidal complex compounds Darwin deposits Devonian dinosaurs earth environment enzymes Eocene Epoch eurypterids evolve existing fishes fossil function geologic germ habitat habitat zones heat herbivorous heredity heredity-chromatin hydrogen ichthyosaurs iguanodont inorganic interaction internal secretion invertebrates Jurassic known lifeless limbs living matter mammalian mammals marine mid-Cambrian mosasaurs Museum of Natural Natural History nitrogen North America observed ocean Oligocene organism origin Osborn ostracoderms oxygen pelagic period Permian phase plants and animals plesiosaurs present primitive primordial principle proteins protoplasm Protozoa reptiles reptilian Sauropoda Schuchert seas sharks similar skeleton species stage structure substances swift-moving teeth terrestrial theory tion tissues Triassic types Upper Cretaceous velocity vertebrates W. K. Gregory Walcott
Page 12 - Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it.
Page 13 - To every action there is always opposed an equal reaction: or, the mutual actions of two bodies upon each other are always equal and directed to contrary pans.
Page 13 - The change of motion is proportional to the motive force impressed ; and is made in the direction of the right line in which that force is impressed.
Page 8 - Causation is indeed too obscure a principle to bear the weight of the whole structure of theology. As for the argument from design, see how Darwinian ideas have revolutionized it. Conceived as we now conceive them, as so many fortunate escapes from almost limitless processes of destruction, the benevolent adaptations which we find in Nature suggest a deity very different from the one who figured in the earlier versions of the argument. The fact is that these arguments do but follow the combined suggestions...
Page x - Thus the long period of evolution, experiment, and reasoning which began with the French natural philosopher, Buffon, one hundred and fifty years ago, ends in 1916 with the general feeling that our search for causes, far from being near completion, has only just begun. "Our present state of opinion is this: we know to some extent how plants and animals and man evolve; we do not know why they evolve.
Page 298 - Bull. 3, p. 1-233, 29 pis. 1914, The Upper Cretaceous and Eocene floras of South Carolina and Georgia : US Geol.
Page 9 - Nature produces those things which, being continually moved by a certain principle contained in themselves, arrive at a certain end."2 What this internal moving principle is remains to be discovered.
Page 57 - It will, in short, become possible to introduce into the economy a molecular mechanism which, like a very cunningly- contrived torpedo, shall find its way to some particular group of living elements, and cause an explosion among them, leaving the rest untouched.
Page 286 - The essential difference between living and nonliving matter consists then in this: the living cell synthetizes its own complicated specific material from indifferent or non-specific simple compounds of the surrounding medium, while the crystal simply adds the molecules found in its supersaturated solution. This synthetic power of transforming small "building stones...