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12o CURRENT TOPICS. of yeast and spent hops have the following composition: water io, proteins 55, non-nitrogenous extraetives and cellulose 24.2, ash 7.8, and fat 3 per cent. They should be worth three dollars per hundred weight. Waterproofing Filter Beds and Reservoirs. (Eng. Record, lxii, i6.)--Mr. H. Ashley, Engineer of the Portsmouth (England) Water Co.'s plant at Farlington, reports that an area of seven acres of floors and walls of the filter beds and reservoirs were waterproofed by twodoi:10.1016/s0016-0032(11)91039-4 fatcat:zcjsq2o74zgdpg2femypn3cqwa