Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina
... Swimming , and Flying . By J. B. PETTIGREW , M. D. , F. R. S. , etc. With 130 Illustrations . $ 1.75 . 9. RESPONSIBILITY IN MENTAL DISEASE . BY HENRY MAUDSLEY , M. D. , $ 1.50 . 10. THE SCIENCE OF LAW . By Professor SHELDON AMOS ...
... Swimming , and Flying . By J. B. PETTIGREW , M. D. , F. R. S. , etc. With 130 Illustrations . $ 1.75 . 9. RESPONSIBILITY IN MENTAL DISEASE . BY HENRY MAUDSLEY , M. D. , $ 1.50 . 10. THE SCIENCE OF LAW . By Professor SHELDON AMOS ...
Pagina 16
... swimming - bell , and there forms a " nerve - ring , " which is divided by the insertion of the " veil " * into an upper and a lower nerve - ring . In many species the upper nerve - ring is spread out in the form of a flattish layer ...
... swimming - bell , and there forms a " nerve - ring , " which is divided by the insertion of the " veil " * into an upper and a lower nerve - ring . In many species the upper nerve - ring is spread out in the form of a flattish layer ...
Pagina 26
... swimming - bell , or nectocalyx . In each case alike this portion of the animal performs the office of locomotion , and it does so in the same way . I have already said that this mushroom - like organ , which constitutes the main bulk ...
... swimming - bell , or nectocalyx . In each case alike this portion of the animal performs the office of locomotion , and it does so in the same way . I have already said that this mushroom - like organ , which constitutes the main bulk ...
Pagina 27
... swimming movements , systole and diastole follow one another with as perfect a rhythm as they do in the beating of a heart . Effects of excising the entire Margins of Nectocalyces . Confining our attention under this heading to the ...
... swimming movements , systole and diastole follow one another with as perfect a rhythm as they do in the beating of a heart . Effects of excising the entire Margins of Nectocalyces . Confining our attention under this heading to the ...
Pagina 28
... swimming - bell and the active contractions of the thread - like portion which has just been removed from its margin is as striking a contrast as it is possible to conceive . Hence it is not surprising that if the margin be left in situ ...
... swimming - bell and the active contractions of the thread - like portion which has just been removed from its margin is as striking a contrast as it is possible to conceive . Hence it is not surprising that if the margin be left in situ ...
Termeni și expresii frecvente
able ambulacral feet artificial rhythm Aurelia aurita become bell blocked brium cause ceased chloroform co-ordination continue contractile strip contractile tissue contraction contraction-waves covered-eyed Medusa crawling curare diastole direction discharge Echinoderm Echinodermata Echinus effect excising excitable tissues experiments fact feeble fibres forceps fresh water function ganglionic glycerine hour Illustrations induction shocks influence instance intervals irritability jelly-fish latter lithocyst locomotor centres manubrium marginal bodies marginal ganglia minutes movements muscle muscular mutilated naked-eyed Medusa natural rhythm nectocalyx nerve nerve-cells nerve-centre nerve-fibres nerve-ring nerve-trunks nervous network nervous system normal sea-water observed occur organ paralyzed pass pedicellariæ pedicels period of latent physiological plexus poison portion prepotent Professor pulsations radial tubes rays reflex reflex action removed response Sarsia seconds segments spasm species specimens spines spontaneity Star-fish strychnia suckers surface swimming motions swimming-bell systole tank temperature tentacles tentacular tetanus Tiaropsis indicans tion umbrella unmutilated animal wave whole