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 Sons, 1899 - 312 pagine |
Dall'interno del libro
Risultati 1-5 di 35
Pagina xi
... later he very probably passed through a gastræa stage . He trav- ersed fish , amphibian , and reptilian grades . The oviparous monotreme and the marsupial almost cer- tainly represent lower mammalian ancestral stages . But what kind of ...
... later he very probably passed through a gastræa stage . He trav- ersed fish , amphibian , and reptilian grades . The oviparous monotreme and the marsupial almost cer- tainly represent lower mammalian ancestral stages . But what kind of ...
Pagina 5
... Later a branch or twig , similar in structure to all the rest , shortens . The cells and tis- sues which in other twigs turn into green leaves here become the petals and other organs of the rose or violet . Let us suppose for a moment ...
... Later a branch or twig , similar in structure to all the rest , shortens . The cells and tis- sues which in other twigs turn into green leaves here become the petals and other organs of the rose or violet . Let us suppose for a moment ...
Pagina 10
... later , Mr. Darwin called attention to the struggle for existence as a means of aggregating these slight modifications in a divergence sufficient to produce new species , genera , or families . His argu- ment may be very briefly stated ...
... later , Mr. Darwin called attention to the struggle for existence as a means of aggregating these slight modifications in a divergence sufficient to produce new species , genera , or families . His argu- ment may be very briefly stated ...
Pagina 16
... later against impassable obstacles . And even if there be a main line of march , advance seems to alternate with retreat , progress with retrogression . To illustrate further , the great waves rush onward only to fall back again , and ...
... later against impassable obstacles . And even if there be a main line of march , advance seems to alternate with retreat , progress with retrogression . To illustrate further , the great waves rush onward only to fall back again , and ...
Pagina 19
... later discovered forms might readily find a place in the system . Hypotheses and theories were looked upon with suspicion . " Even Linnæus , " says Romanes , " was express in his limitations of true scien- tific work in natural history ...
... later discovered forms might readily find a place in the system . Hypotheses and theories were looked upon with suspicion . " Even Linnæus , " says Romanes , " was express in his limitations of true scien- tific work in natural history ...
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 - 1896 |
The Whence and the Whither of Man: A Brief History of His Origin and ... John Mason Tyler Visualizzazione completa - 1897 |
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 digestion and reproduction dominant embryo embryology entoderm existence experience eyes fish functions future ganglion gastrula germ-plasm give groups 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 race reflex action reptiles result schematic worm segments selfish sense-organs sequence shell skeleton species spermatozoa stage structure struggle surface survive swimming tion tissues true truth turbellaria unselfishness variation velopment vertebral column vertebrates volvox young