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 |
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Risultati 6-10 di 30
Pagina 55
... SKELETON AND HEAD . IN tracing the genealogy of any American family it is often difficult or impossible to say whether a certain branch is descended from John Oldworthy or his cousin or second cousin . In the latter cases to find the ...
... SKELETON AND HEAD . IN tracing the genealogy of any American family it is often difficult or impossible to say whether a certain branch is descended from John Oldworthy or his cousin or second cousin . In the latter cases to find the ...
Pagina 58
... skeleton ; and that this resulted from , and almost irrevocably fixed , certain habits of life . We may picture to ourselves the primitive ancestor of mollusks as a worm having the short and broad form of the turbellaria , but much ...
... skeleton ; and that this resulted from , and almost irrevocably fixed , certain habits of life . We may picture to ourselves the primitive ancestor of mollusks as a worm having the short and broad form of the turbellaria , but much ...
Pagina 65
... skeleton . But the skeleton of the mollusk was purely protective , a hindrance to locomotion . That of the in- sect is still somewhat protective , but is mainly , almost purely , locomotive . It is never allowed to become so heavy as to ...
... skeleton . But the skeleton of the mollusk was purely protective , a hindrance to locomotion . That of the in- sect is still somewhat protective , but is mainly , almost purely , locomotive . It is never allowed to become so heavy as to ...
Pagina 66
... skeleton . In very large animals , or where the skeleton is internal , it would hardly be practicable ; the risk of compression of the tubes at some point , and of thus cutting off the air - supply of some portion of the body , would be ...
... skeleton . In very large animals , or where the skeleton is internal , it would hardly be practicable ; the risk of compression of the tubes at some point , and of thus cutting off the air - supply of some portion of the body , would be ...
Pagina 67
... skeleton is a thickening of the horny cuticle of the annelid on the surface of each segment . The horny cylinder surrounding each segment is composed of several pieces , and on the abdomen these are united by flexible , infolded ...
... skeleton is a thickening of the horny cuticle of the annelid on the surface of each segment . The horny cylinder surrounding each segment is composed of several pieces , and on the abdomen these are united by flexible , infolded ...
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