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A comparison of the Seger, Kallauner, and calculated rational analysis is made, Results obtained are observed and using a Florida kaolin and a Tennessee ball clay. discussed. The Kallauner MethodThe following is a brief outline of the Kallauner method of rational a n a l y s i~.~The material is dried to a constant weight and then treated with HC1 for fifteen minutes to remove the carbonates. The loss on ignition is determined by heating the residue over a Meker burner for thirty minutes. The water of combination is found by carefully heating a weighed sample of the dried material a t a uniform rate for one hour in an electric furnace to 650 to 700" and re-weighing.The procedure then is as follows: The residue is treated with HCl and maintained a t the boiling point for three hours in a water bath. After digesting, filter, wash with distilled water into a 250-cc. flask, cool, and make up to the mark. Take 100 cc. of the filtrate and evaporate to dryness in a porcelain dish; add 2 cc. concentrated HCI to the residue; mix for five minutes; filter.The alumina in the filtrate is determined in the usual way. Take another 100 cc. of the filtrate and determine the ferric oxide volumetrically. ( R 2 0 3 -Fez03 =A1203 in the clay substance.) The residues are treated with H F in the usual way to remove the silica. The residue from this treatment is treated with 5% sulphuric acid and the alumina in the solution is determined. (This gives the alumina in the feldspathic materials.) The quartz is then found by difference. ProcedureBriefly, the water of combination was determined by heating weighed samples, dried a t 105", for one hour in an electric furnace. The temperature was held at approximately 700°, and checked by a pyrometer. For the digestion, the No. 1 sample of each clay was treated with 60 cc. HCl, equal parts concentrated acid and water, No. 2 samples treated with 40 cc. HCI and 20 cc. water, and No. 3 with 50 cc. acid and 10 cc. water. The material was digested for three hours on a water bath, filtered, and washed.