Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 28
... severed margin . This continues its rhyth- mical contractions with a vigour and a pertinacity not in the least impaired by its severance from the main organism , so that the contrast between the perfectly motionless swimming - bell and ...
... severed margin . This continues its rhyth- mical contractions with a vigour and a pertinacity not in the least impaired by its severance from the main organism , so that the contrast between the perfectly motionless swimming - bell and ...
Pagina 29
... severed margin of the swim- ming - bell ; for whether this portion be large or small , the locomotor centres contained in the margin are alike sufficient to supply the stimulus to contraction . Indeed , if only the tiniest piece of ...
... severed margin of the swim- ming - bell ; for whether this portion be large or small , the locomotor centres contained in the margin are alike sufficient to supply the stimulus to contraction . Indeed , if only the tiniest piece of ...
Pagina 34
... severance of the manubrium from the rest of the animal . In many of the experiments subsequently to be detailed , therefore , I began by removing the manu- brium , in order to afford better facilities for manipulation . Summary of ...
... severance of the manubrium from the rest of the animal . In many of the experiments subsequently to be detailed , therefore , I began by removing the manu- brium , in order to afford better facilities for manipulation . Summary of ...
Pagina 40
... severed margin alone be experimented upon , the same unfailing response may be obtained to luminous stimulation as that which is obtained from the entire animal . The fact last mentioned indicates that the mar- ginal bodies are organs ...
... severed margin alone be experimented upon , the same unfailing response may be obtained to luminous stimulation as that which is obtained from the entire animal . The fact last mentioned indicates that the mar- ginal bodies are organs ...
Pagina 68
... sever the mass of tissue at z from the rest of the umbrella , the only connection between them being the narrow neck of tissue at z . Yet , in the case to which I refer , the contraction waves emanating from passed in the directions ...
... sever the mass of tissue at z from the rest of the umbrella , the only connection between them being the narrow neck of tissue at z . Yet , in the case to which I refer , the contraction waves emanating from passed in the directions ...
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