Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 7
... further , and to object on similar grounds to the horrible cruelty of skinning potatoes and boiling them alive . Thus , before any rational scruples can arise with regard to the vivisection of a living organism , some reasonable ground ...
... further , and to object on similar grounds to the horrible cruelty of skinning potatoes and boiling them alive . Thus , before any rational scruples can arise with regard to the vivisection of a living organism , some reasonable ground ...
Pagina 17
... further strengthened by a peculiar modification of the other tissues in the neighbourhood , which had been previously described by Professor Haeckel . In all species the upper nerve - ring lies entirely in the ectoderm . Its principal ...
... further strengthened by a peculiar modification of the other tissues in the neighbourhood , which had been previously described by Professor Haeckel . In all species the upper nerve - ring lies entirely in the ectoderm . Its principal ...
Pagina 21
... further supply much * See " Observations on the Nervous System of Aurelia aurita , " Phil . Trans . , pt . ii . , 1878 . interesting information touching the structure of the sense - organs 3 STRUCTURE OF THE MEDUSE . 21.
... further supply much * See " Observations on the Nervous System of Aurelia aurita , " Phil . Trans . , pt . ii . , 1878 . interesting information touching the structure of the sense - organs 3 STRUCTURE OF THE MEDUSE . 21.
Pagina 30
... Further , although such mutilation of an umbrella is usually followed by a paralysis as sudden and marked as that which follows such mutilation of a swimming - bell , the paralysis of the former differs from the paralysis of the latter ...
... Further , although such mutilation of an umbrella is usually followed by a paralysis as sudden and marked as that which follows such mutilation of a swimming - bell , the paralysis of the former differs from the paralysis of the latter ...
Pagina 42
... further question , however , still remained to be determined . The pigment spot of the marginal body in Medusæ is , as L. Agassiz observed , placed in front of the presumably nervous tissue , and for this reason he naturally enough ...
... further question , however , still remained to be determined . The pigment spot of the marginal body in Medusæ is , as L. Agassiz observed , placed in front of the presumably nervous tissue , and for this reason he naturally enough ...
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