Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 6
... suppose them capable of conscious suffering would be in the highest degree unreasonable . Thus , for instance , they are considerably lower in the scale of organization than an oyster , and in none of the experiments which I have ...
... suppose them capable of conscious suffering would be in the highest degree unreasonable . Thus , for instance , they are considerably lower in the scale of organization than an oyster , and in none of the experiments which I have ...
Pagina 23
... term " excitability . " Suppose that a * " Die Medusen physiologisch und morphologisch auf ihr Nervensystem untersucht " ( Tübingen , 1878 ) . muscle has been cut from the body of a freshly STRUCTURE OF THE MEDUSE . 23.
... term " excitability . " Suppose that a * " Die Medusen physiologisch und morphologisch auf ihr Nervensystem untersucht " ( Tübingen , 1878 ) . muscle has been cut from the body of a freshly STRUCTURE OF THE MEDUSE . 23.
Pagina 53
... suppose that the paralyzed Aurelia has been left quiet for several minutes in sea - water at forty - five degrees , and that it is then stimulated by means of a single induction shock ; the responsive contrac- tion will be comparatively ...
... suppose that the paralyzed Aurelia has been left quiet for several minutes in sea - water at forty - five degrees , and that it is then stimulated by means of a single induction shock ; the responsive contrac- tion will be comparatively ...
Pagina 66
... suppose that seven of these eight ganglia are cut out , the remaining one then continues to supply its rhythmical discharges to the muscular sheet of the bell , the result being , at each discharge ,. 66 JELLY - FISH , STAR - FISH , AND ...
... suppose that seven of these eight ganglia are cut out , the remaining one then continues to supply its rhythmical discharges to the muscular sheet of the bell , the result being , at each discharge ,. 66 JELLY - FISH , STAR - FISH , AND ...
Pagina 67
... Suppose , now , a number of radial cuts are made in the disc according to such a plan as this ( Fig . 9 ) , wherein every radial cut deeply overlaps those on either side of it . The contraction waves which now originate from the ...
... Suppose , now , a number of radial cuts are made in the disc according to such a plan as this ( Fig . 9 ) , wherein every radial cut deeply overlaps those on either side of it . The contraction waves which now originate from 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