Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 28
... active , the death - like stillness which results from the loss of so minute a portion of their substance is rendered by contrast the more surprising . From this experiment , therefore , I conclude that in the margin of all the species ...
... active , the death - like stillness which results from the loss of so minute a portion of their substance is rendered by contrast the more surprising . From this experiment , therefore , I conclude that in the margin of all the species ...
Pagina 40
... active in the light than they are in the dark , the comparative duration of the quiescent stages being less in the former than in the latter case . Light thus appears to act towards these animals as a constant stimulus . Lastly , it may ...
... active in the light than they are in the dark , the comparative duration of the quiescent stages being less in the former than in the latter case . Light thus appears to act towards these animals as a constant stimulus . Lastly , it may ...
Pagina 118
... active random motions previously described . In such cases , however , it is observable that the further away from the manubrium the stimulus is applied , the less active is the response of this organ . In very many instances , indeed ...
... active random motions previously described . In such cases , however , it is observable that the further away from the manubrium the stimulus is applied , the less active is the response of this organ . In very many instances , indeed ...
Pagina 130
... active ganglion , has reached the passive one . And this I find to be generally the case ; for it may usually be observed that one or more of the lithocysts are either tempo- rarily or permanently prepotent over the others , i.e. that ...
... active ganglion , has reached the passive one . And this I find to be generally the case ; for it may usually be observed that one or more of the lithocysts are either tempo- rarily or permanently prepotent over the others , i.e. that ...
Pagina 239
... active swimming motions of the Sarsia in the sea - water and their cessation of all motion in the fresh water very suggestive of instantaneous death ; but a short time after immersion in the latter their contractile tissues , as ...
... active swimming motions of the Sarsia in the sea - water and their cessation of all motion in the fresh water very suggestive of instantaneous death ; but a short time after immersion in the latter their contractile tissues , as ...
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