CHEMISTRY. 7J 5 



required, lie bus attempted to shorten the method })y previously 

 heatinj^ the sample with calcium l)isulphite solution (8° Baume) for 4 

 to 8 hours at 11<> to l-iC-^ C. in a sealed tube, and then proceeding as 

 before. 



Widely different results were obtained ])y the -i different methods, 

 the modified Midler and Lange methods giving the lowest results. 

 The Schulze-Henneberg and Miiller methods are both believed to be 

 too complicated and tedious, and the author believes that an exact and 

 simple method for determining cellulose has yet to be devised. 



The detection of foreign coloring matters in canned tomatoes, 

 G. Halphen {Jour, rharm. H Chim.. 6. ser., 11 {1900), pp. 169-172; 

 ahs. ill Ai)'/h/.^t, 2o {1900), Aug., p. 206). — Directions are given for 

 detecting coal-tar colors and cochineal. The desiccated pulp is treated 

 with glacial acetic acid for 10 minutes and the liquid then mixed with 

 twice its volume of 90 per cent alcohol and filtered after 10 miiuites' 

 standing. The ffltrate is diluted with 10 times its volume of water 

 and tested with a small amount of silk floss, the liquid being boiled 

 for at least 15 minutes. In the presence of coal-tar colors the silk 

 assumes a rose or salmon coloi*. 



In testing for cochineal the dried residue is thoroughly mixed with 

 h3"drochloric acid and the paste shaken with twice its volume of 90 per 

 cent alcohol. The filtrate is diluted as before and shaken with amyl 

 alcohol. The 2 layers formed are separated with the aid of carbon 

 bisulphid. If cochineal is present the filtrate will have a rose color, 

 and the coloring matter may be extracted with amyl alcohol, forming 

 a 3'ellowish red solution. The latter may be tested with uranium 

 acetate, with which it gi\'es a characteristic green coloration. 



Handbook of industrial organic chemistry, S. P. Sadtler (Philadelphia: J. B. 

 Lippincott Co., 1900, 3. ed., pp. XVIII'^543, Jigs. 126). — In this edition every chapter 

 has been revised and new matter added, those on natural and artificial dye colors 

 being largely rewritten. "Some old and less important matter has been omitted and 

 tl>e bibliographical data and statistics have been brought up to date. 



Commercial organic analysis, A. H. Allen {Philadelphia: P. Blakiston'ii Son & 

 Co., 1900, vol. 3, pjt. 1, pp. XVl-'ro<S9). — This is a revision and enlargement by J. 

 !Merritt jMatthews, and treats of tannins, dyes and c(.)loring matters, and writing inks. 



The oil chemist's handbook, E. Hopkins {Xeto York: Joint Wiley & aS'oh.s-, 1900, 

 pp.YIII+72). 



Synoptic tables for the analysis of fertilizers and soil amendments, 

 P. Gori'iL {Tableaux .'ii/i)oj>ti(jue.'< pjoirr V analyse des ein/raix et des anie}nlenient><. Paris: 

 .7. B. Bailliere d- fils, 1900, pp. SO, Jigs. 3). — These tables give concise directions for 

 the preparation of reagents carrying out the determinations and calculating the 

 results in the analysis of the ordinar}^ fertilizing materials and 'Amendments, includ- 

 ing fei'tilizing chemicals, guano, dried blood, horn, meat, solid and liquid manure, 

 poudrette, vinasse, sewage, lime, limestone, marl, and gypsum. 



The preparation of an exact standard acid, G. L. Hicjgins {Jour. Soc. Chem. 

 Lid., 19 (1900) , Xo. 11, pp. 938-962, Jigs. 2). — The method and apparatus used in the 

 preparation of a standanl acid from gaseous liydrochloric acid are described. 



The determination of potash by means of phospho-molybdic acid (Ann. 



