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, 1897 - 312 pagine |
Dall'interno del libro
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Pagina v
... Annelids and arthro- pods : The external locomotive skeleton leads to temporary rapid advance , but fails of the goal . - Its disadvantages . - Vertebrates : The internal loco- motive skeleton leads to backbone and brain . - Reasons for ...
... Annelids and arthro- pods : The external locomotive skeleton leads to temporary rapid advance , but fails of the goal . - Its disadvantages . - Vertebrates : The internal loco- motive skeleton leads to backbone and brain . - Reasons for ...
Pagina 57
... annelids and culminating in 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 certain line ...
... annelids and culminating in 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 certain line ...
Pagina 61
... annelids . Of these our common earthworm is a good example , and near them belong the leeches . But the marine annelids , of which nereis , or a clam - worm , is a good example , are more typical . They ... ANNELID WORMS TO VERTEBRATES 61.
... annelids . Of these our common earthworm is a good example , and near them belong the leeches . But the marine annelids , of which nereis , or a clam - worm , is a good example , are more typical . They ... ANNELID WORMS TO VERTEBRATES 61.
Pagina 62
... ( ANNELID ) . LANG , FROM EHLERS . bands of longitudinal mus- cles . These latter have been grouped in the four quad- rants , a much more effective arrangement than the cyl- indrical layer of the sche- matic worm . Furthermore , the ...
... ( ANNELID ) . LANG , FROM EHLERS . bands of longitudinal mus- cles . These latter have been grouped in the four quad- rants , a much more effective arrangement than the cyl- indrical layer of the sche- matic worm . Furthermore , the ...
Pagina 63
... ANNELID . LANG . dp and up , dorsal and ventral halves of parapodia ; b and ac , bristles ; k , gill ; dc and vc , feelers ; rm , lateral muscles ; Im , longitudinal muscles ; vd , dorsal blood - vessel ; vo , ventral blood - vessel ...
... ANNELID . LANG . dp and up , dorsal and ventral halves of parapodia ; b and ac , bristles ; k , gill ; dc and vc , feelers ; rm , lateral muscles ; Im , longitudinal muscles ; vd , dorsal blood - vessel ; vo , ventral blood - vessel ...
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 - 1899 |
Parole e frasi comuni
advance amoeba amphibia anatomical ancestors animal kingdom annelid apes appear appetite archenteron attained become better birds body brain cells conformity to environment conscious degeneration dominant ectoderm embryo embryology existence experience eyes fish functions future ganglion gastrula gills give groups 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 membrane ment mental mind mode modified mollusks moral mouth muscles muscular muscular system mutability of species natural selection nephridia nerve nervous system never notochord nutriment organs oxygen parapodia perception perivisceral cavity 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 theory of evolution tion tissues true truth turbellaria unselfishness variation velopment vertebrates volvox young