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 |
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Pagina 61
... segments move easily upon each other , and thus the animal can creep or writhe . These segments are very much alike except the first two and the last . If we examine one from the middle of the body we shall find its structure very much ...
... segments move easily upon each other , and thus the animal can creep or writhe . These segments are very much alike except the first two and the last . If we examine one from the middle of the body we shall find its structure very much ...
Pagina 62
... segment a pair of fin - like projections , stiffened with bristles , the parapodia . These are moved by special muscles and form effective organs of creeping . Within the muscles is the perivisceral cavity , and in its central axis the ...
... segment a pair of fin - like projections , stiffened with bristles , the parapodia . These are moved by special muscles and form effective organs of creeping . Within the muscles is the perivisceral cavity , and in its central axis the ...
Pagina 63
... SEGMENT OF ANNELID . LANG . dp and up , dorsal and ventral halves of parapodia ; b and ac , bristles ; k , gill ; dc ... segment ; then of a chain of ganglia , one to each segment , on the ventral side of the body . With one ganglion in ...
... SEGMENT OF ANNELID . LANG . dp and up , dorsal and ventral halves of parapodia ; b and ac , bristles ; k , gill ; dc ... segment ; then of a chain of ganglia , one to each segment , on the ventral side of the body . With one ganglion in ...
Pagina 64
... segment , and is becoming more a centre of control and perception for the body as a whole . It is more like our brain , com- mander - in - chief , the other ganglia constituting its staff . The sense - organs have improved greatly ...
... segment , and is becoming more a centre of control and perception for the body as a whole . It is more like our brain , com- mander - in - chief , the other ganglia constituting its staff . The sense - organs have improved greatly ...
Pagina 65
... The annelid had two anterior segments differ- ing from those of the rest of the body ; these may , perhaps , be considered as the foreshadowings of a structure. 9. MYRMELEO FORMICARIUS . ANT - LION . HERTWIG ,. 5 WORMS TO VERTEBRATES 65.
... The annelid had two anterior segments differ- ing from those of the rest of the body ; these may , perhaps , be considered as the foreshadowings of a structure. 9. MYRMELEO FORMICARIUS . ANT - LION . HERTWIG ,. 5 WORMS TO VERTEBRATES 65.
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