Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 29
... continue its contractions for hours , or even for days . Effects of excising the entire Margins of Umbrellas . Turning now to the covered - eyed division of the Medusæ , I find , in all the species I have come across , that excision of ...
... continue its contractions for hours , or even for days . Effects of excising the entire Margins of Umbrellas . Turning now to the covered - eyed division of the Medusæ , I find , in all the species I have come across , that excision of ...
Pagina 71
... continue to discharge its function . Indeed , so remarkable does this fact appear , that to avoid accepting it we may well feel inclined to resort to another hypothesis , namely , that these contraction - waves do not depend for their ...
... continue to discharge its function . Indeed , so remarkable does this fact appear , that to avoid accepting it we may well feel inclined to resort to another hypothesis , namely , that these contraction - waves do not depend for their ...
Pagina 72
... continue to pass through a strip more than thirty times that length ; and between these two extremes there are all possible grades of tolerance . Now it seems to me that if the tissue through which these contraction - waves pass is ...
... continue to pass through a strip more than thirty times that length ; and between these two extremes there are all possible grades of tolerance . Now it seems to me that if the tissue through which these contraction - waves pass is ...
Pagina 86
... continue , however , to countenance his views touching the improvement of functional capacity which nerve - fibres , when already formed , undergo by use ; and this , which is in itself an important matter , is the point with which I ...
... continue , however , to countenance his views touching the improvement of functional capacity which nerve - fibres , when already formed , undergo by use ; and this , which is in itself an important matter , is the point with which I ...
Pagina 91
... continue to pass in b d , and vice versa . Now , all these various cases are what we might expect to occur , in view of the variable points at which contraction - waves become blocked in spiral strips , etc .; for if the contractile ...
... continue to pass in b d , and vice versa . Now , all these various cases are what we might expect to occur , in view of the variable points at which contraction - waves become blocked in spiral strips , etc .; for if the contractile ...
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