302 EXPERIMENT STATION RECORD. 



J020-1022). — A continuatiou of previous work (E. S. R., 20, p. 110), aud in- 

 cludiug the, following articles: A Phospbatid from Lupinus albus, by E. Win- 

 terstein aud L. Stegmaun ; A Pbospbatid Prepared from Wbeat Meal, by E. 

 Wiuterstein and K. Smolensk! ; Ou the Preparation of Pbospbatids from Wbeat 

 Germs, by K. Smolensk! ; and On a Pbospborus Constituent of the Leaves of 

 Ricinus, by E. Wintersteiu and L. Stegmaun. 



The methods of obtriiuing phosphatids from these plants are given in detail. 



Tables for calculating phosphoric acid from magnesium pyrophosphate, 

 O. GoLTSCHKE (Tabelle zur Umrcchnung dcr pyropJiospliumaurcii Mayncsia auf 

 Phosphormurc. Brunswicic, 1908, pp. 7; rev. in Chem. Ztg., 33 {1909), No. 

 JiS-'t'i, p. -'{01). — The calculations are made for each half milligram from 0.5 gm. 

 of magnesium pyrophosphate upward, the coffiecient used being 0.03757. 



Simplification of the determination of hardness in water, E. E. Basch 

 (Jour. Gafibchucltt., 52 {1909), pp. l.',.}, ].',G; abs. in Chcni. Zcntbl., 1909, I, No. 

 15, pp. 126Ji, 1265). — This article suggests modifications of the methods of Telle 

 (E. S. R.. 21, p. 8) aud of Boutron and Boudet by which hardness may be 

 quicklj- measured by the number of drops of soap solution required. 



Colorimetric determination of dissolved oxygen in water, G. B. Frank- 

 roRTER, G. W. Walker, and A. D. Wilhoit {Jour. Amcr. Client. Soc., 31 {1909), 

 A'o. 1, pp. 35-Ji3, fig. 1 ) . — The method proposed is based upon the change in color 

 of cupi'ous ammonium chlorid when brought in contact with oxygen. A special 

 form of apparatus iu which a solution of pure colorless cuprous aumionium 

 chlorid can be prepared and kei)t I'oady for use at all times is described. 



The interpretation of a water analysis {Mo. Bui. N. Y. State Dept. Health, 

 25 {1909), No. .'i, pp. 92-9.'i). — The significance of the determination of albumi- 

 noid aud free ammonia, oxygen consumed, nitrites and nitrates, chlorin, and 

 bacteriological analysis is explained. The author concludes " that except in 

 those cases where fecal pollution is entirely absent, a sanitary analysis can 

 seldom definitely establish the fact that a given sample of water is from a 

 supply which is either entirely safe or absolutely dangerous. It can point out 

 probable danger, and as such is an aid to be used in connection with other 

 sources of information." 



On the quantitative determination of the soot content of air, G. Orsi (Arch. 

 Jlyg., 68 {1908), No. 1, pp. 10-21; abs. in Chem. Zentbl., 1909, I, No. 5, p. JiOt).— 

 The author foimd Rubner's method for the determination of the soot content of 

 air to be practical and easily carried out. A Weber photometer was success- 

 fully used. The soot content was found to vary widely with the weather, rain 

 being more active in purifying the air than snow, and fog holding soot firmly. 

 The soot content was found to be greatest in the morning. 



The determination of the germ content of the air, KiJiiL {Pliartn. Ztg.. 5ff 

 {1909) , No. 31, pp. 308, 309, fig. 1). — A simple method for drawing a known volume 

 of air through nutrient gelatin and so ascertaining the germ content is described. 



The accuracy of the determination of various forms of nitrogen in soil 

 extracts, Densch {Mitt. Kaiser Wilhelms Inst. Landic. Bromberg, 1 {1908), 

 No. 2, pp. 207; abs. in Centbl. Balct. [eic], 2. Abt., 22 {1909), No. lJf-17, p. 

 Ji20). — The results of tests which tend to show the inaccuracy of methods com- 

 monly emi>loyed are siuumarized. 



The estimation of some organic plant acids, G. Jorgensen {Ztsehr. Unter- 

 sueh. NaJir. u. Genussmtl., 17 {1909), No. 7, pp. 396-Jfl2). — An extended study 

 of methods together with the results of numerous analyses. 



The biuret reaction and the cold nitric acid test in the recognition of 

 protein, K. II. van Xokman {Bio-Chem. Jour., J/ {1909), No. 3-.), pp. 127-135). — 

 In a watery solution of albumin the limit of delicacy of the biuret reaction 

 is "0.0004 per cent, or 4 parts of albumin in 1,000,000 pai-ts of distilled water. 



