506 EXPERIMENT STATION EECOED. [Vol.88 



Experiments to determine whether or not proteoses are original constituents 

 of milli were unsuccessful. Examination of Siegfried's " nucleon " ' showed 

 that it is probably a mixture of uucoagulable protein and some still unidenti- 

 fied organic substances yielding phosphoric acid on hydrolysis. From the alco- 

 holic washings of casein a protein was isolated resembling gliadin of wheat in 

 its solubility in alcohol. An investigation of its physical and chemical proper- 

 ties is to be reported later. 



Adenin and guanin in cow's milk, C. Voegtlin and O. P. Sherwin (Jour. 

 Biol. Chem., 33 {1918), No. 1, pp. 145-149). — This article reports in detail the 

 methods and data in the determination of adenin and guanin in milk, previously 

 noted (E. S. R., 37, p. 308). The questiou as to whether the purins of milk 

 are derived from the blood purins or formed from the breaking down of the 

 nucleic acid in the mammary gland is still undecided. 



Standard methods of sam.pling and analysis and standard samples, W. F. 

 HiLLEBRAND {Proc. 2. Pan Amer. Sci. Cong., 1915-16, vol. 8, pp. 68-85 ). --Pre- 

 viously noted from another source (E. S. R., 35, p. 415). 



A simple, efficient, and economic filter; its application to the fi.ltration of 

 the yellow precipitate in phosphoric acid estimations, S. L. .Iodidi and E. H. 

 Kellogs (Proc. 2. Pan Amer. Sci. Cong., 1915-16, vol. 8, pp. 704-708).— Pre- 

 viously noted from another source (E. S. R., 35, p. 314). 



The application of the paper pulp filter to the quantitative estimation of 

 calcium and magnesium, S. L. Jodidi and E. H. Kellogg (Proc. 2. Pan Amer. 

 Sci. Cong., 1915-16, vol. 8, pp. 843-849). — Previously noted from another source 

 (E. S. R., 34, p. 712). 



A quantitative estimation of acetic, propionic, and butyric acids, R. D. 

 Crowell (Jour. Amer. Chem. Soc, 40 (1918), No. 2, pp. 453-460). — The method 

 employed by the author consists in the extraction of butyric acid by means of 

 kerosene from an aqueous solution to which calcium chlorid and a little 

 potassium chlorid liave been added as salting agents. Some propionic acid is 

 extracted with the butyric, but can be determined by the method of distilla- 

 tion and neutralization with barium hydroxid. The method is described in 

 detail and data given of the mean error in the method of separation. 



Experimental work with the method suggested by Phelps and Palmer (E. S. 

 R., 37, p. 206) proved unsatisfactory. 



The identification and estimation of lead in water, I, R. Meldrum (Chem. 

 News, 117 (1918), No. S036, pp. 49, 50).— This is a report of investigations into 

 the sensitiveness and reliability of the hydrogen sulphid and potassium chromate 

 colorimetrlc methods for the detection and estimation of lead in water. 



It is pointed out that with the hydrogen sulphid process different waters 

 with equal lead contents give unequal coloration intensity due to the coloring 

 matter in the water sample and also to its saline constituents and other 

 unknown factors. This error may be overcome by using as a standard, 

 instead of distilled water, a sample of the same water which has been rendered 

 lead free. When distilled water is used for the standard, the lead is likely 

 to be underestimated by at least 25 to 33 per cent. With the same water at 

 variable lead dilutions with slightly excessive ratios of reagents, the resulting 

 coloration for any specific lead dilution is also not constant as regards the 

 hydrogen sulphid process. 



The hyrirogen sulphid colorimetric process in use by the author is described 

 In detail. Experimental data will be given later. 



The manganese content of the ash of certain drugs, L. E. Westman and 

 R. M. Row AT (Jour. Amer. Chem. Soc, 40 (1918), No. 3, pp. 558-562). — Data 



» Hoppe-Seyler's Ztschr. Phys. Chem., 21 (1895-96), No. 5-6, pp. 373-375. 



