The royal natural history . tter,and hurling along ill rapid a, flagellated chamber of bread-crumb sponge, showing collar-succession opaque masses, whichit strewed everywhere many experiments, Grant convinced himself that a current flowed out ofall the large orifices, and not into one and out of another. He also rubbedpowdered chalk on the surface of a bread-crumb sponge, and saw particles whichclogged the margins of the minute pores on the surface driven into the interior;and thereby demonstrated the passage of currents into the interior throughthe pores. The origin of the sponge
The royal natural history . tter,and hurling along ill rapid a, flagellated chamber of bread-crumb sponge, showing collar-succession opaque masses, whichit strewed everywhere many experiments, Grant convinced himself that a current flowed out ofall the large orifices, and not into one and out of another. He also rubbedpowdered chalk on the surface of a bread-crumb sponge, and saw particles whichclogged the margins of the minute pores on the surface driven into the interior;and thereby demonstrated the passage of currents into the interior throughthe pores. The origin of the sponge-fountains was now traced. In all spongescurrents of water pass into the body through pores, and out again by one ormore ways different from those by which they entered. To ascertain the causeof the currents, it is necessary to examine the anatomy of the sponge. A thinskin, which can be peeled off, is separated from the body by numerous minutesupporting pillars. On cutting into the sponge, large canals are seen passing down. CELLS ; b, FLAGELLATED CHAMBER OF FRESH-WATER SPONGE. (Both figures 1600 diameters.)—After Vosmaer. 528 SPONGES. from the oscules and branching into the body, and much narrower canals fromthe groups of pores in the skin. The channels from the pores divide up intominute lacunar spaces, or canaliculi, which finally communicate with the interiorof small, spherical, flagellated chambers, whose walls are perforated by of the chambers is the five-hundredth of an inch in diameter, and groups
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectzoology
