MARCH 5, 1881. �UIENTlIrIC AMERICAN SUPPLEMENT, No. 270_ 430'1 · _----------_._ -=---=_._=-== =.= =-=--='---=�= == == =-= == =-: := == == and 0'003 after softening. The pUl'ifying effect is thus very I at temperatures above 32° a sligbt diminution of pl'essure marked, and affords the means of reducing the organic I might enormollsly raise the melting point . matter at least as low as tbat of Loch Katrine water, and MI'. T. Brown said that be did not quite understand bow prodllcing nearly tbe

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... e softness. The possible value of removing tbe pressure from the outside of the ice could an application of the softening process in such a way tImt. affect the ice in the interior, and it was difficmlt to see why the large and costly reservoirs are unnecessary is thus very J tbe ice in the interior should not liquefy if rniRed 10 180°, great, and those interested in water supply may see the sys-! even if the diminution of pressnre prcvented the liquefaction tem in operation at the ",Vestminstcr Aquarium, where it has I of the sUt'face layer. been in use a few months on a small scale, softening and fil-A vote of thanks to D1'. C[�ruelJy from a crowded meeting tel'ing about a thousand gallons per hom for the fresh-watel': was then passed by acclamation. lish-tanks . The Thames water trom the water company's: -------------was such that the temperature remained sensilll . v the same during the eontinuance of each experiment. The number ()f �ecc,nds req uired for the thermometer to rise from 25" to 50' was registel'ed fI s in the first case.