Hardwicke's science-gossip : an illustrated medium of interchange and gossip for students and lovers of nature . kept in good working order forseveral days, a power of £ employed, and the con-densers brought to bear with great to this, the bath was readily reversed, andthat without dangerto the object. The slimness ofthe glass also proved of further value, as, in con-sequence of its flexibility, the sides could be broughtinto contact without fracture!. Fig. 28. Disc of Melicerta ringens. The arrows show thedirection of the currents. On using the £, my attention was immediatel
Hardwicke's science-gossip : an illustrated medium of interchange and gossip for students and lovers of nature . kept in good working order forseveral days, a power of £ employed, and the con-densers brought to bear with great to this, the bath was readily reversed, andthat without dangerto the object. The slimness ofthe glass also proved of further value, as, in con-sequence of its flexibility, the sides could be broughtinto contact without fracture!. Fig. 28. Disc of Melicerta ringens. The arrows show thedirection of the currents. On using the £, my attention was immediatelydrawn to the great extent of the ciliated surfaces ;the whole of the upper portion of the creatureseemed to be alive with their action. Not only werethe lobes fringed with cilia, but a second row wasfound to exist on the inner surface of the two upperlobes, the action of which was for some time mis-taken for currents of water. This inner series is inconnection with the two finger-like valves, whichprotect the entrance to the gullet; and its especialoffice is to pass forward to them all particlesbrought within its influence; these are then in-spected by the cilia covering the valves, and ifconsidered lit, are allowed to enter the passageleading to the gizzard. From this a ciliated surfaceextends to the lintel or chin over the mould ; itsaction creates a strong back current, by which allthat is unfit for food is thrown off, with the excep-tion of certain particl
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectscience
