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evaporation of these reagents, the conversion into chlorides and 

 the separation of silica by evaporation with hydrochloric acid, 

 drying, and dissolving in the same acid, the reduction of ferric 

 chloride to ferrous chloride by the addition of aluminium powder, 

 the precipitation of barium sulphate by the slow addition of 

 dilute barium chloride to the cold liquid, which is diluted very 

 largely and is not stirred during the addition of the reagent, and 

 finally the weighing of the barium sulphate in a Gooch crucible. 

 It was found that iron in the ferrous condition does not interfere 

 with the precipitation, and that although a little barium chloride 

 is occluded in the precipitate this error appears to be compen- 

 sated by solubility, so that it is not necessary to make any correc- 

 tion in the results. — Proceedings 8th Intemat. Congress App. 

 Chem., i, 33. h. l. w. 



3. Separation of Arsenic from Antimony and other Metals. — 

 Moser and Perjotel have devised a convenient method for 

 removing arsenic from other metals by distilling it off with a 

 current of air at the temperature of the water bath from a strong 

 hydrochloric acid solution containing methyl alcohol. If the 

 arsenic is in the higher state of oxidation, a reducing agent, pre- 

 ferably a ferrous salt, must also be added. The arsenic goes 

 over partly as trichloride and partly as methyl arsenite, both of 

 wbich are decomposed by water in a receiver, into which the air 

 and vapors are passed. The chief advantages of the method 

 consist in the avoidance of a stream of hydrochloric acid gas, 

 and the rapidity and completeness of the separation. Only 

 about 1^ hours are required for the distillation. The test 

 analyses given are very satisfactory. — Monatshefte, xxxiii, 797. 



H. L. W. 



4. Methods in Chemical Analysis ; by Frank Austin Gooch. 

 8vo, pp. 536. New York, 1912 (John Wiley & Sons).— Ana- 

 lytical chemists everywhere will welcome this summary by 

 Professor Gooch of the methods worked out by himself and his 

 pupds in the Kent Chemical Laboratory of Yale University, and 

 published in this Journal during the past twenty-two years. 

 The book in giving this condensed account of these researches is 

 very impressive in showing not only the great number of the 

 investigations, but also their high quality and importance. 

 Professor Gooch is to be most highly congratulated for what he 

 has done for the benefit of analytical chemistry, and it is to be 

 hoped that his valuable work will continue for many years to 

 come. h. l. w. 



5. Elementary Applied Chemistry ; by Lewis B. Allyn. 

 12mo, pp. 127. Boston, 1912 (Ginn and Company). — At a first 

 glance this book has a somewhat humorous aspect. The frontis- 

 piece is a photograph of a large class of young ladies working in 

 a laboratory where the results of ice-cream analyses are displayed 

 upon a blackboard, and also in the preliminary " Suggestions 

 to Teacher and Pupil " the heating together of aniline, caustic 

 potash solution and chloroform is recommended, " if the odor of 



