Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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... LIGHT AND PHOTOGRAPHY IN THEIR AP- PLICATION TO ART , SCIENCE , AND INDUSTRY . By Dr. HERMANN VOGEL , Royal Industrial Academy of Berlin . With 100 Illustrations . $ 2.00 . 15. FUNGI : Their Nature and Uses . By M. C. COOKE , M. A. , LL ...
... LIGHT AND PHOTOGRAPHY IN THEIR AP- PLICATION TO ART , SCIENCE , AND INDUSTRY . By Dr. HERMANN VOGEL , Royal Industrial Academy of Berlin . With 100 Illustrations . $ 2.00 . 15. FUNGI : Their Nature and Uses . By M. C. COOKE , M. A. , LL ...
Pagina 39
... light as a stimulus is most marked and unfailing . In the case of Sarsia , for instance , a flash of light let fall upon a living specimen almost invariably causes it to respond with one or more contractions . If the animal is vigorous ...
... light as a stimulus is most marked and unfailing . In the case of Sarsia , for instance , a flash of light let fall upon a living specimen almost invariably causes it to respond with one or more contractions . If the animal is vigorous ...
Pagina 40
... light than they are in the dark , the comparative duration of the quiescent stages being less in the former than in the latter case . Light thus appears to act towards these animals as a constant stimulus . Lastly , it may be stated ...
... light than they are in the dark , the comparative duration of the quiescent stages being less in the former than in the latter case . Light thus appears to act towards these animals as a constant stimulus . Lastly , it may be stated ...
Pagina 41
... light . Indeed , close against the glass they formed an almost solid mass , which followed the light wherever it was moved . The individuals composing this mass dashed them- selves against the glass nearest the light with a vigour and ...
... light . Indeed , close against the glass they formed an almost solid mass , which followed the light wherever it was moved . The individuals composing this mass dashed them- selves against the glass nearest the light with a vigour and ...
Pagina 42
... light into the water as before . The difference in the behaviour of the mutilated and of the unmutilated specimens was very marked . The three individuals which still had their marginal bodies sought the light as before , while the nine ...
... light into the water as before . The difference in the behaviour of the mutilated and of the unmutilated specimens was very marked . The three individuals which still had their marginal bodies sought the light as before , while the nine ...
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