What people are saying - Write a review
We haven't found any reviews in the usual places.
Other editions - View all
action active adaptation adaptive radiation algæ America amphibians ancestral animals appear aquatic atmosphere bacteria become beginning birds body Cambrian carbon causes cell changes characters Charles chemical chromatin closely compared complex compounds continuous Cretaceous deposits dinosaurs direction discovered early earth elements energy entirely environment evolution evolve example existing fishes follows fossil four function geologic germ habitat heat heredity higher hydrogen important individual interaction internal known less light limbs lines living lower mammals marine matter mechanical modes motion Museum namely Natural nitrogen North America observed ocean organism origin oxygen period Permian phase physical physicochemical plants present primitive principle probably processes proportions protoplasm reactions recent region relatively reptiles REPTILIA Restorations rise seas selection showing similar species stage structure substances surface Teleosts terrestrial theory tion tissues Triassic types Upper vertebrates zones
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 290 - 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 278 - 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...