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Chern. SOC., 1912, 34, 51.)-Filtration of large volumes of liquids containing very fine precipitates by means of asbestos fibre and the Witte plate is sometimes inconvenient, and it is claimed that there is an advantage in the use of "alundum" (fused aluminium oxide) discs made by the Norton Company of Worcester, Mass., which are to be had in several grades with pores of different sizes. They fit into a glass funnel by means of an ordinary flat rubber band, and their use makes possible thedoi:10.1039/an9123700108 fatcat:uj3wsg74sney7a3sp47dymojjm