334 EXPERIMENT STATION RECORD. 



./, pp. 126-136, 193-208; abs. in Analyst, 30 (1905), No. 354, pp. 314, 315).— The appli- 

 cability of the Kjeldahl method to the determination of nitrogen in such compounds 

 as creatin, creatinin, lysin, and uric acid is discussed and precautions to be observed 

 to secure accuracy are explained. 



A modification of the Kjeldahl method for the determination of total nitro- 

 gen in urine, A. Babes (Bui. Pharm. et Chim. Roumanie, 1905, May-June; abs. in 

 Ann. Chim. Analyt., 10 (1905), No. 9, p. 366). — In the method proposed 1 to 5 cc. of 

 urine is digested in a 100 cc. flask with 2 cc. of hydrogen peroxid, 0.1 to 0.15 gm. of 

 sodium oxalate, and 1 to 1.5 cc. of concentrated sulphuric acid. The time of diges- 

 tion never exceeds 1'. hours. Sodium hydroxid maybe added and the nitrogen 

 determined in the usual way, or it may be determined volumetrically by means of 

 sodium hypobromite. 



Volumetric determination of nitrous acid by means of eerie sulphate, G. 

 Barbieri ( Chem. Ztg., 29 (1905), pp. 668, 669; abs. in Analyst, 30 (1905), No. 354, p. 

 320) . — The nitrite is oxidized to nitrate by the addition of an excess of eerie sul- 

 phate, the excess of the latter being decomposed by the addition of potassium iodid 

 and the liberated iodin titrated as usual. 



On the determination of ammonia in water, Cavalier and Artus (Bid. Soc. 

 Chim. Paris, 33 (1905), pp. 745-747; abs. in Analyst, 30 (1905), No. 354, p. 319).— 

 From the results of a series of experiments the authors conclude that the iodid 

 method of Trillat and Turchet (E. S. R., 17, p. 112) is less sensitive than that of 

 Nessler, no coloration being perceptible until the proportion of ammonia is as much 

 as 3 rag. per liter. This necessitates, in case of water containing small amounts of 

 ammonia, evaporation Avhich is as tedious as the distillation in the Nessler process. 

 It was also found that the black coloration of the iodid was very unstable and dis- 

 appeared almost completely after 2 or 3 minutes. 



Determination of the organic nitrogen in potable waters, J. C. Brown % (Proc. 

 Chem. Soc. London, 21 (1905), pp. 208, 209; abs. in Analyst, 30 (1905), No. 354, P- 316).— 

 "Details are given of a process for the determination of the whole of the organic 

 nitrogen in water and sewage effluents. The process essentially consists in the dis- 

 tillation to dryness and subsequent ignition of a mixture of a portion, usually 200 cc, 

 of the sample, without previous evaporation, with potassium hydroxid and potassium 

 permanganate. The operation is carried out either in a Jena glass or in a copper 

 retort, and the evolved ammonia is determined by Nessler' s reagent as usual." 



Report of committee on standard methods of water analysis to the labo- 

 ratory section of the American Public Health Association (Jour. Infect. Diseases, 

 1905, Sup. 1, May, pp. 1-141)- — This is the report made to the laboratory section at 

 the Havana meeting of the American Public Health Association, January 9, 1905, 

 outlining the progress in water analysis and describing the best current practice. 

 The report is based on the results of 5 years' cooperative work on the part of several 

 of the most active water analysts and bacteriologists of the country and covers in 

 great detail the whole field of water analysis, physical, chemical, microscopical, and 

 bacteriological, including under the latter a revision of the report of the bacteriological 

 committee of the American Public Health Association published in 1897. 



"The methods of analysis presented in this report as 'standard methods' are 

 believed to represent the best current practice of American water analysts, and to be 

 generally applicable in connection with the ordinary problems of water purification, 

 sewage disposal, and sanitary investigations. . . . Detailed descriptions of the 

 various methods recommended are given in concise form, covering the essential fea- 

 tures of each determination. It is assumed that those using these directions are 

 thoroughly grounded in the fundamental principles of chemistry and biology, and 

 that they are also familiar with the leading literature upon the subject." 



The report brings out quite sharply the limitations which have been placed on 

 purely chemical determinations such as "free ammonia" and "albuminoid ammo- 



