AGRICULTURAL CHEMISTRY AGROTECHNY, 303 



shown in that no more coagulation with rennet took place when caseiu was 

 dissolved in raw milk. 



The distribution of nitrogen in cow's, buffalo's, goat's, woman's and ass's 

 milk by acid and rennet precipitation, W. Friedheim (Biochcm. Ztsclir., 19 

 (1909), Xo. 1-2, PI). 132-155, pJ. i).— It is shown by this work that what is 

 characteristic of cow's milk in regard to the distribution of nitrogenous matters 

 in the whey from rennet is also characteristic of goat's, buffalo's, and human 

 milk, this whey containing as much as 10 per cent more soluble nitrogenous 

 bodies than the whey which is obtained by coagulating with acid. Only in the 

 case of ass's milk was it less. 



[An ammonia-producing enzym in the silkworm], T. Takeuchi and R. 

 INOUE (Jotir. Col Agr. Imp. Univ. Tokyo, 1 {1909), No. 1, pp. 15-20).— An 

 enzym was obtained from the silkworm moth which is capable of yielding 

 ammonia from the amino compounds. The greatest bulk of ammonia was 

 produced from asparagin. 



Contributions to micro-chemical analysis, N. Schoorl (Ztschr. Analyt. 

 Chem., ^S {1909), No. 11, pp. 665-678, 728).— This is a continuation of work 

 previously noted (E. S. R., 22, p. 8). It considers (pp. 6G5-678) the sulphates 

 of calcium, strontium, barium and lead, silver nitrate, bromid. iodid and cyanid, 

 the oxids of antimony, iron, chromium, zinc and aluminum, silicic acid and sili- 

 cates, and a few substances such as Berlin blue, calcium fluorid, sulphur, and 

 graphite. Corrections to the different articles in this series are also given 

 (p. 728). 



Total nitrogen determination by the Kober method, F. W. Gill and H. S. 

 Grindley (Jour. Anicr. Chem. *SV;f., ,}/ (1909), No. 11, pp. 12-'t9-1252) .—The 

 authors conclude that Kober's aeration method in nitrogen determinations in 

 organic compounds has many advantages over the other distillation methods 

 and can well be used except in instances where magnesium and phosphorus are 

 present together in relatively large amounts. In this case good results can be 

 obtained by keeping the Kjeldahl flask warm during the aerating period. 



Determination of small quantities of nitrates, L. Farcy (Bui. Soc. Chiiii. 

 France, If. ser., 5 (1909), No. l.'i, pp. 775-779; ahs. in Jour. Soc. Chem. Indus., 

 28 (1909), No. 15, p. 849; Chem. Zenthl., 1909, II, No. 13, p. 1078).— From a 

 study of methods the author concludes that MacGowan's method (E. S. R., 16, 

 p. 949) yields good results in the presence of chlorids but not in the presence of 

 ammonium salts. Frerichs' method (E. S. R., 17, p. 112) in the presence of 

 chlorids gives results 4 or 5 per cent too high and is also without value in the 

 presence of ammonium salts. The method of Grandval and Lajoux as modified 

 by Perrier and Farcy (E. S. R., 21, p. 8) is considered more accurate. 



Determination of potash with phosphomolybdic acid, Grete (Chem. Ztg., 

 33 (1909), No. 127, p. 1128).— The author attempted to determine the potash by 

 precipitation with phosphomolybdic acid, dissolving it in an ammouiacal solu- 

 tion, precipitating with magnesia mixture and titrating the phosphoric acid 

 with Grete's glue-molybdic acid method. The results were not entirely satis- 

 factory. 



The detection of arsenic acid in the presence of arsenious acid with mag- 

 nesia mixture, O. Lutz and R. Swinne (Ztschr. Anorgan. Chem., 64 (1909), 

 No. 3, pp. 298-301 ) . — The authors conclude from the results of their work that 

 it is well-nigh impossible to obtain a satisfactory separation, either qualitative 

 or quantitative, of arsenic acid from arsenious acid, when present in appreciable 

 amounts, by the usual magnesia mixture method. Solutions of arsenious acids 

 in water or ammonia were found more sensitive tow.-u-d magnesia mixture 

 than an alkali arsenite, and the presence of much annnonia salt hinders the 

 reaction to quite a degree. If. however, the arsenite is present in certain con- 



