Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
Din interiorul cărții
Rezultatele 1 - 5 din 70
Pagina 7
... fact that the animals are alive . constitutes no such ground ; for the insectivorous plants are also alive , and exhibit even more phy- siological " sensitiveness " and capability of rapid response to stimulation than is the case with ...
... fact that the animals are alive . constitutes no such ground ; for the insectivorous plants are also alive , and exhibit even more phy- siological " sensitiveness " and capability of rapid response to stimulation than is the case with ...
Pagina 15
... fact that before the appearance of Haeckel's memoir , Leuckart was the only observer who spoke for the fibrillar character of the so - called marginal ring- nerve ; so that in Haeckel's researches on Geryonia , whereby both true ...
... fact that before the appearance of Haeckel's memoir , Leuckart was the only observer who spoke for the fibrillar character of the so - called marginal ring- nerve ; so that in Haeckel's researches on Geryonia , whereby both true ...
Pagina 32
... fact that in this experiment the principal portion of the " veil ” * is of necessity removed , so that it becomes impos- sible to decide how much of the enfeebling effect of the section is due to the removal of locomotor centres from ...
... fact that in this experiment the principal portion of the " veil ” * is of necessity removed , so that it becomes impos- sible to decide how much of the enfeebling effect of the section is due to the removal of locomotor centres from ...
Pagina 38
... fact that while these tissues are not nearly so sensitive to this mode of excitation as might be anticipated , they are , as just observed , extraordi- narily sensitive to mechanical excitation . It there- fore becomes difficult to ...
... fact that while these tissues are not nearly so sensitive to this mode of excitation as might be anticipated , they are , as just observed , extraordi- narily sensitive to mechanical excitation . It there- fore becomes difficult to ...
Pagina 40
... fact last mentioned indicates that the mar- ginal bodies are organs of special sense , adapted to respond to luminous stimulation ; or , in more simple words , that they perform the functions of sight . Now it has long been thought more ...
... fact last mentioned indicates that the mar- ginal bodies are organs of special sense , adapted to respond to luminous stimulation ; or , in more simple words , that they perform the functions of sight . Now it has long been thought more ...
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