33G EXPERIMENT STATION RECORD. 



modification of Kopfer's method " is applied in Dniiias' method, the method of con- 

 ducting the (•ond)U8tion Ijcing descri])ed in detail. 



The applicability of Dumas' method of determining- nitrogen to g-as mix- 

 tures, C. CnAKiTSCHKOKK {ZhuT. Ein^s. Fl~. Khim. Oh><hrh., Jo {1903), pp. 411-41'i; 

 ahx. In CIti'm. Cevthh, lUO.i, TT, No. .T, p. Jll). 



Concerning methods of estimating nitrogen and protein in feces, A. Zaits- 

 CHKK {Arch. Physiol. [Pjtuffer], 9S {1903), Xo. 11-lJ, pp. 595-613). — Experiments 

 whi(;li are reported led the author to conclude that feces in drying undergo a marked 

 loss of nitrogen which is greater in the case of carnivora than of herhivora. Adding 

 acid when the feces are dried does not entirely prevent this loss, and if accurate 

 results are desired the nitrogen should be determined in a nund)er of samjjles of 

 fresh feces. To learn the digestibility of protein the albuniinoid nitrogen in food 

 and feces should be determined. The nitrogen lost in drying feces is dependent 

 upon the amount of nonalbuminoid nitrogen present and is doubtless also influenced 

 by the water content of the feces. 



The oxidation of atmospheric nitrogen by means of electrical discharges, 

 F. VON Lei>el {Ber. Thiit. ('hem. GeselL, 36 {1903), No. >',,pp. 1251-125S).—X brief 

 account of studies of conditions favoring the process. 



Table for calculating protein from nitrogen using the factor 6.25, 

 O. GoLTscHKE {Ztschr. Amdyt. Cheni., 42 {1903), No. S, Sup., pp. 10). — The protein 

 values are given corresponding to amounts of nitrogen ranging from 0.01 to 16 per 

 cent. 



The determination of nitric acid in -water, A. Muller {ZtsrJtr. Angev. ('Jicni., 

 16 {1903), No. 31, pp. 746, 747). — The method of Schulze-Tiemann is considered 

 preferable to that of Frerichs (E. S. R., 14, p. 940). 



A new quantitative method of determining ammonia, A. Bayer {Chem. Zig., 

 27 {1903), No. 66, jjp. S09, 810). — The method is applicable to such solutions as sew- 

 age, liquid manure, tanning liquors, etc., and is as follows: To 100 cc. of the solution 

 add 2 cc. of fuming hydrochloric acid and 2 drops of phenolphthalein and for each 

 50 mg. of NII3 per liter 15 cc. of 10 per cent magnesium chlorid. Add 12 to 15 gm. 

 of pulverized disodium phosphate and shake in a rotary apparatus until the phos- 

 phate is completely dissolved, then add sodium hydrate solution drop by drop until 

 a faint permanent rose color is obtained. The gelatinous precipitate formed becomes 

 crystalline after standing -4 hour and the rose color disappears. Add soda solution 

 until the color remains permanent, allow to stand \ hour, and filter without washing. 

 Distill annnonia from the filter and contents by means of magnesium oxid. 



Progress in the field of the chemistry of waters, including natural and 

 artificial mineral waters, A. (toldberc^ {Chem. Ztg., 27 {1903), No. 71, pp. S69- 

 S74). — A review (with numerous references) of the literature published on this sub- 

 ject during 1902. 



A new method for the determination of organic substances in waters, more 

 particularly in those containing chlorids and bromids, C Lenormand {Bui. 

 Soc. Cliiiii. Bans, 3. ser., 29 {1903), No. 15, pp. SIO-8I4). — A colorimetric method is 

 proposed in which the color obtained by adding permanganate to the Avater without 

 further treatment is compared with that obtained by adding sodium bicarbonate 

 along with the permanganate and boiling. 



The infl.uence of distilled water on the determination of the reducing power 

 of potable and sewage water by means of permanganate soKition, H. Noll 

 {Ztschr. Angew. Chem., 16 {1903), No. 31, jyp. 747, 7^9).— Distilled water was found 

 to introduce a decided error, which should be determined and corrected. 



Solubility of gypsum in solutions of sodium chlorid, A. i)'ANSELME(i^t/i. Soc. 

 Chilli. Boris, 3. ser., 29 {1903), pp. 372-374; (tf>s- >»' -four. Chem. Sor. [London], 84 



"Monatsh. Chem., 7 (1896), p. 9. 



