Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 48
... strip , and all its lithocysts are removed ; single induction - shocks are then thrown in with a key at one end of the strip - every shock , of course , giving rise to a con- traction wave . If these shocks are thrown in at a somewhat ...
... strip , and all its lithocysts are removed ; single induction - shocks are then thrown in with a key at one end of the strip - every shock , of course , giving rise to a con- traction wave . If these shocks are thrown in at a somewhat ...
Pagina 49
... strip be , whatever disturbances are set up at one end are faithfully transmitted to the other . For instance , if an Aurelia be cut into the longest possible strip with a remnant of the disk left attached at one end , as represented in ...
... strip be , whatever disturbances are set up at one end are faithfully transmitted to the other . For instance , if an Aurelia be cut into the longest possible strip with a remnant of the disk left attached at one end , as represented in ...
Pagina 50
... strip . Period of Latency , and Summation of Stimuli . I shall now give an account of my experiments in the period of latency and the summation of stimuli . To do this , I must first describe the method which I adopted in order to ...
... strip . Period of Latency , and Summation of Stimuli . I shall now give an account of my experiments in the period of latency and the summation of stimuli . To do this , I must first describe the method which I adopted in order to ...
Pagina 58
... strip of small width and great length , and if all the lithocysts are removed except one at one end of the strip , it may be observed that , after the occurrence of a natural pause , the first discharge only penetrates perhaps about a ...
... strip of small width and great length , and if all the lithocysts are removed except one at one end of the strip , it may be observed that , after the occurrence of a natural pause , the first discharge only penetrates perhaps about a ...
Pagina 71
... strip is only made about half an inch broad , it may be made more than a yard long before all the bell is used up in making the strip ; and as nothing can well be imagined as more destructive of the continuity of a nerve - plexus than ...
... strip is only made about half an inch broad , it may be made more than a yard long before all the bell is used up in making the strip ; and as nothing can well be imagined as more destructive of the continuity of a nerve - plexus than ...
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