The Whence and the Whither of Man: A Brief History of His Origin and Development Through Conformity to Environment; Being the Morse Lectures of 1895C. Scribner's son, 1896 - 312 pagine |
Dall'interno del libro
Risultati 1-5 di 35
Pagina 11
... Insects generally from a hundred to a thousand . Even birds , slowly as they increase , produce in a lifetime probably ... insect let us suppose that only sixty develop into the first larval , caterpillar , stage . Of these sixty , the ...
... Insects generally from a hundred to a thousand . Even birds , slowly as they increase , produce in a lifetime probably ... insect let us suppose that only sixty develop into the first larval , caterpillar , stage . Of these sixty , the ...
Pagina 13
... insect in a given area may be said to run a race of which the prize is life , and the losing of which means literally death . The competition is inconceivably severe . How indefinitely slight will be the difference between the poorest ...
... insect in a given area may be said to run a race of which the prize is life , and the losing of which means literally death . The competition is inconceivably severe . How indefinitely slight will be the difference between the poorest ...
Pagina 57
... insects . The molluscan and articulate lines , though divergent , are of great importance to us as throwing a certain amount of light on vertebrate development ; and still more as showing how a ... insect and a WORMS TO VERTEBRATES 57.
... insects . The molluscan and articulate lines , though divergent , are of great importance to us as throwing a certain amount of light on vertebrate development ; and still more as showing how a ... insect and a WORMS TO VERTEBRATES 57.
Pagina 58
... insect and a fish , we find clearly , I think , that the fundamental anatomical dif- ference lies in the skeleton ; and that this resulted from , and almost irrevocably fixed , certain habits of life . We may picture to ourselves the ...
... insect and a fish , we find clearly , I think , that the fundamental anatomical dif- ference lies in the skeleton ; and that this resulted from , and almost irrevocably fixed , certain habits of life . We may picture to ourselves the ...
Pagina 61
... insects , and forms the kingdom of arthropoda . The lower members are still usually reckoned as worms , and are included under the annelids . Of these our common earthworm is a good example , and near them belong the leeches . But the ...
... insects , and forms the kingdom of arthropoda . The lower members are still usually reckoned as worms , and are included under the annelids . Of these our common earthworm is a good example , and near them belong the leeches . But the ...
Altre edizioni - Visualizza tutto
The Whence and the Whither of Man: A Brief History of His Origin and ... John Mason Tyler Visualizzazione completa - 1896 |
The Whence and the Whither of Man: A Brief History of His Origin and ... John Mason Tyler Visualizzazione completa - 1897 |
The Whence and the Whither of Man: A Brief History of His Origin and ... John Mason Tyler Visualizzazione completa - 1899 |
Parole e frasi comuni
advance amoeba amphibia anatomical ancestors animal kingdom annelid apes appear appetite archenteron attained become beginning better birds body brain cells cerebrum characteristics conformity to environment conscious degeneration dominant ectoderm embryo embryology entoderm experience eyes fish functions future ganglion gastrula germ-plasm give groups heredity higher animals higher forms highest human hydra important increase individual insect instinct intelligence jaws knowledge laws layer legs living locomotion lower mammals man's marsupial ment mental mind mode modified mollusks moral motives muscles muscular muscular system natural selection nephridia nerve nervous system never notochord nutriment organs oxygen parapodia perception possible primitive probably progress protoplasm protozoa purely reflex action reptiles result schematic worm segments selfish sense-organs sequence shell skeleton species spermatozoa stage structure struggle surface survive swimming theory of evolution tion tissues true truth turbellaria unselfishness variation velopment vertebral column vertebrates volvox young