806 EXPERIMENT STATION RECOED. 



acid. The heating is continued until the mass is absolutely dry and the silicic 

 acid is rendered insoluble. Fifty-five cc. of water and 20 cc. of hydrochloric 

 acid are then added and the whole is heated for from 30 to 45 minutes on a 

 sand bath, being careful not to go to the point of dryness. After filtering, the 

 residue on the filter is washed with from 100 to 125 cc. of water. To the filtrate 

 and washings barium chlorid is added, heated, concentrated slightly, and the 

 remainder of the procedure conducted in the usual mannei*. 



Report of committee of the fertilizer division of the American Chemical 

 Society, F. B. Carpenter et al. (Jour. /»(///.s'. and Eugin. Chem., J {1912), 

 yo. 3, pp. 223-225). — This is a report of the committee on fertilizer legislation 

 (potash, phosphate rock, and nitrogen), presented at the forty-fifth meeting of 

 the American Chemical Society, held at Washington, D. C, in December, 1911. 



Methods of organic analysis, H. C. Sherman (New York, 1912, 2. ed., rev. 

 and enl., pp. XVI-\-It01, figs. 18).— This publication (E. S. R., 17, p. 732) has 

 been rewritten and enlarged to include a chapter on solid and liquid fuels, and 

 sections on industrial alcohol, drying oils, crude petroleum, new international 

 methods of glycerin analysis, and quantitative methods for assaying enzyms. 

 The discussions on aldehydes, sugars, proteins, and food preservatives have 

 been somewhat extended. 



Allen's commercial organic analysis, edited by W. A. Davis and S. S. 

 Sadtlek (Philadelphia, 1912, If. ed., rev., vol. 6, pp. IX+726, pis. 2, figs. 6). — 

 This volume has been entirely rewritten. Among its contents are methods of 

 analysis of amins and ammonium bases, anilin and its allies, naphthylamins, 

 pyridin, quinoliu and acridin bases, vegetable alkaloids, volatile bases of vege- 

 table origin, nicotin and tobacco, aconite alkaloids, atropin and its allies, 

 cocaine, opium, strychnos alkaloids, cinchona alkaloids, berberine. calfein. tea 

 and coffee, and cocoa and chocolate. The properties of the above substances are 

 also discussed. 



A modified Wiley extraction apparatus, W. D. Richardson and E. F. 

 ScHERUBEL (Jmir. Indus, and Engln. Chem., 4 (1912), No. 3, pp. 220, 221).— 

 The Wiley apparatus has been modified into three forms so that it may be used 

 for the extraction of tankage, cotton-seed meats and meals, meat and sausages, 

 soap, etc. 



New reactions for salicylic acid, E. Barral (BuL Soc. Chim. France, 4 ser., 

 11 (1912). No. 8, pp. .'fl7-',20) .—A description of 4 new reactions. 



In regard to the macroscopic and microscopic detection of carotin, M. 

 TswETT (Ber. Deut. Bot. GeselL, 29 (1911), No. 9, pp. 630-636; abs. in Zentbl. 

 Biochem. u. Biophys.. 12 (1912), No. 19-20, p. 778). — Molisch's potassium and 

 Tswett's resorcin methods are not specific reactions for detecting carotin micro- 

 scopically, and they indicate only lipochromes, that is, carotin groups, which in 

 the end means very little. Doubt also exists as to whether the red crystals 

 obtained with the Frank and Tschirch acid method are in reality composed 

 entirely of carotin. In all events, it will be necessary to investigate the work 

 of those whose results were obtained with these methods, in regard to the dis- 

 tribution of carotin in the vegetable kingdom. It is believed that macroscopic 

 methods will have to be used in future investigations. 



The detection of adulterations by colloidal chemical methods, E. Mareiaoje 

 (Ztschr. Chem. ii. Indus. KoUoide, 11 (1912), No. 1, pp. 1-5, figs. 8). — As many 

 of the fruit juices and other materials used in the manufacture of jellies and 

 marmalades are first passed through filter presses, the materials entering 

 into their composition can be detected only with difficulty by the usual micro- 

 scopic methods. With the thought in mind that colloidal chemical methods 

 might be effective for this purpose experiments were conducted with the 

 following mixtures: (1) Agar (1 per cent), gel 46 gm., cane sugar 10 gm. ; 



