Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 22
... seen in how striking a manner all the microscopical observations to which I have now briefly alluded are confirmed by the physiological observations - or , more correctly , I might say that the microscopical observations , in so far as ...
... seen in how striking a manner all the microscopical observations to which I have now briefly alluded are confirmed by the physiological observations - or , more correctly , I might say that the microscopical observations , in so far as ...
Pagina 38
... seen responsive contractions of the whole umbrella follow upon the exceedingly slight stimulus caused by a single drop of sea - water let fall upon the irritable surface from the height of one inch . As regards chemical stimulation ...
... seen responsive contractions of the whole umbrella follow upon the exceedingly slight stimulus caused by a single drop of sea - water let fall upon the irritable surface from the height of one inch . As regards chemical stimulation ...
Pagina 59
... seen that if a single stimula- tion , whether of a natural or artificial kind , is supplied to the excitable tissues of a jelly - fish , a short period , called the period of latency , will elapse , and then the jelly - fish will give a ...
... seen that if a single stimula- tion , whether of a natural or artificial kind , is supplied to the excitable tissues of a jelly - fish , a short period , called the period of latency , will elapse , and then the jelly - fish will give a ...
Pagina 60
... seen that this effect depends upon the repe- tition of the process of stimulation , and not upon that of the process of contraction . Now , effects very similar to these have been found to occur in the case of the excitable plants by Dr ...
... seen that this effect depends upon the repe- tition of the process of stimulation , and not upon that of the process of contraction . Now , effects very similar to these have been found to occur in the case of the excitable plants by Dr ...
Pagina 68
... seen that the effect of this cut is almost completely to 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 ...
... seen that the effect of this cut is almost completely to 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 ...
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