Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina
... TION OF WORMS . With Observations on their Habits . By CHARLES DARWIN , LL . D. , F. R. S. With 15 Illustrations . $ 1.50 . The International Scientific Series .- ( Continued . ) 3 2 The International Scientific Series .- ( Continued . )
... TION OF WORMS . With Observations on their Habits . By CHARLES DARWIN , LL . D. , F. R. S. With 15 Illustrations . $ 1.50 . The International Scientific Series .- ( Continued . ) 3 2 The International Scientific Series .- ( Continued . )
Pagina
... TION OF WORMS . With Observations on their Habits . By CHARLES DARWIN , LL . D. , F. R. S. With 15 Illustrations . $ 1.50 . The International Scientific Series . ( Continued . ) 3 2 The International Scientific Series .- ( Continued . )
... TION OF WORMS . With Observations on their Habits . By CHARLES DARWIN , LL . D. , F. R. S. With 15 Illustrations . $ 1.50 . The International Scientific Series . ( Continued . ) 3 2 The International Scientific Series .- ( Continued . )
Pagina 29
... tion on umbrellas is neither so certain nor so com- plete as it is on swimming - bells . That is to say , although in the majority of experiments such mutilation of umbrellas is followed by immediate paralysis , this is not invariably ...
... tion on umbrellas is neither so certain nor so com- plete as it is on swimming - bells . That is to say , although in the majority of experiments such mutilation of umbrellas is followed by immediate paralysis , this is not invariably ...
Pagina 39
... tion from darkness to light acts upon Sarsia as a stimulus , and this even though the transition be but of momentary duration . The question there- fore arises as to whether the stimulus consists in the presence of light , or in the ...
... tion from darkness to light acts upon Sarsia as a stimulus , and this even though the transition be but of momentary duration . The question there- fore arises as to whether the stimulus consists in the presence of light , or in the ...
Pagina 44
... tion ; so that , whether the excitation is of a strong or of a weak intensity , the period of latent stimulation is not much affected . The above question , therefore , was simply this - Does the pro- longed delay on the part of these ...
... tion ; so that , whether the excitation is of a strong or of a weak intensity , the period of latent stimulation is not much affected . The above question , therefore , was simply this - Does the pro- longed delay on the part of these ...
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