. Journal of applied microscopy and laboratory methods. te, since theglucinum sulphate, GISO4 • 4H2O, which is also to be referred to the tetragonalsystem, sometimes separates in thin, six-sided plates. //. Normal Potassium Oxalate added to solutions of salts of Glucinum causesthe separation of a difficultly soluble Double Oxalate of Potassium and K2C2O4 + GISO4 = K2C2O4 . GIC2O4 + K2S04- Method.—To the moderately concentrated solu-tion add a little acetic acid, then a fragment of thereagent about twice as large as is usually the casein micro-chemical work. Almost immediately large,
. Journal of applied microscopy and laboratory methods. te, since theglucinum sulphate, GISO4 • 4H2O, which is also to be referred to the tetragonalsystem, sometimes separates in thin, six-sided plates. //. Normal Potassium Oxalate added to solutions of salts of Glucinum causesthe separation of a difficultly soluble Double Oxalate of Potassium and K2C2O4 + GISO4 = K2C2O4 . GIC2O4 + K2S04- Method.—To the moderately concentrated solu-tion add a little acetic acid, then a fragment of thereagent about twice as large as is usually the casein micro-chemical work. Almost immediately large,clear, colorless, highly refractive prisms of themonoclinic systems are obtained. These prismsunite to form twins and radiating masses (Fig. (»5). Remarks.—The appearance of the crystalsvaries greatly, according to the amount of thereagent present, as compared with that of little potassium oxalate will yield only a pre-cipitate of tiny crystals which probably consist of ^^the normal oxalate of glucinum. Too much re- ?=» Fig. and Laboratory Methods. 1375 agent, on the other hand, gives rise to skeleton crystals and to masses ofthin lenticular plates. During the disintegration of the fragment of potassium oxalate while passinginto solution (particularly in concentrated solutions), crystals of the reagentappear mof/w/itari/y, which bear a striking resemblance to some of the formsassumed by the double glucinum potassium oxalate. In testing unknown solu-tions the worker must be on his guard lest he fall into error by deciding toohastily. The double oxalate of glucinum and potassium can be readily recrystallized fromwater by gently warming the preparation and allowing it to cool slowly. Thesalt is also soluble in solutions of ammonium carbonate, a property which canbe utilized when there is doubt as to the nature of the precipitate obtained in thecourse of an analysis. The addition of a little mercuric chloride will induce the production of longprisms and tw
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