CHEMISTRY. 723 



butter. When this deposit is crystallized from ether very perfect crystals of large 

 size are obtained. Up to the present time I have only examined 6 samples by this 

 method, 3 of butter and 3 of oleomargarin, and as the crystals obtained in the two 

 cases are in some respects similar, I do not feel able to make a positive statement 

 in regard to the diagnostic value of this test in all cases. However, the difference 

 in the appearance of the crystals, so far as I have yet observed, seems to be suf- 

 ficiently great to serve as a means of distinguishing butter from oleomargarin." 



The carbohydrates of rye, barley, and wheat at different periods, H. Jessen- 

 Hansex (Medd. Carlsberg Lab., 4 (1896), pp. 145-19.3; abs. in Centbl. Agr. Chem., 26 

 (1897), pp. 630-636; Jour. Chem. Soc. {London], 72 (1897), No. 421, II, p. 581). 



On the chemical behavior of diastase and the determination of its action 

 when soluble starch is used ; and on araban found in diastase preparations, I. A. 

 Wroblewski (Ztschr. Physiol. Chem., 24 (1897), No. 3, pp. 173-223, figs. 5). 



On the duration of the activity of the oxidizing ferments of mushrooms in 

 solution in glycerin, E. Bourquelot (Compt. Rend. Soc. Biol. Paris, 1897, p. 454; 

 abs. in Bui. Soc. Chim. Paris, 3. ser., 17 (1897), No. 24, p. 1051).— By macerating 250 

 gm. Lactarius rclutinus for 1 hour in 850 gin. of glycerin and filtering, a solution was 

 obtained which did not undergo decomposition or lose its oxidizing properties for a 

 year. 



Investigations on the constituents of protein : A new method of separating 

 albumomoses and peptones, E. P. Pick (Ztschr. Physiol, (hem., 24 (1897), No. 3, pp. 

 246-275). 



On the cleavage products of a protein compound prepared from seeds of 

 Coniferee, E. SCHULZE (Ztschr. Physiol. Chem., 24 (1897), No. .?, pp. 27G-2S4). 



Chemical and bacteriological investigation of the fermentation of fresh grass, 

 0. Emmerling (Ber. Dent. Chem. Gesell., 30 (1897), pp. 1869, 1870; abs. in Jour. Chem. 

 Soc. [London], 72 (1897), No. 421, II, p. 579). 



On the analysis of silicates, A. Leclerc (Compt. Rend. .lead. Set. Paris, 125 (1897), 

 No. 22, pp. 893,894). 



A comparison of various methods for determining carbon dioxid and carbon 

 monoxid, L. M. Dennis and C. G. Edgar (Jour. Amer. Chem. Soc, 19 (1897), No. 11, 

 pp. S59-870). 



Determination of different kinds of sugar, A. BorntraGER (Staz. Sper. Agr. 

 Ital., 30, p. 325; abs. in Bui. Soc. Chim. Paris, 3. ser., 18 (1S97). No. 23, p. 12S0).— The 

 polarimetric and gravimetric (Fehling-Soxhlet) methods were compared on different 

 kinds of wine musts. 



Determination of nitric acid in drinking water, Devarda (Ztschr. Allg. Osterr. 

 Apoth. Ver., 1897, p. 257; abs. in Vrtljschr. Chem. Nahr. it. Genussmtl., 12 (1897), No. 2, 

 p. 273). — Evaporate i to 2 liters of the water to be examined to about 300 cc, add 

 2 gm. of pulverized aluminum bronze (containing 59 per cent of aluminum, 39 per 

 cent of copper, and 2 per cent of zinc), and 20 cc. of 30 per cent potash solution free 

 from nitrate. Let stand i hour and distil off ammonia into acid with gentle heat. 



A new method for the determination of phosphoric acid, Woy (Ztschr. Offentl. 

 Chem., 3 (1897), p. 321; abs. in Analyst, 22 (1SD7), Dec, p. 333).— Further remarks on the 

 author's method which has already been noted (E. S. R., 9, p. 321). The reasons for 

 the adoption of a 3 per cent molybdic solution are explained. Since certain chlorids 

 interfere with the precipitation "the author dissolves raw phosphates in sulphuric 

 acid (taking care to prevent the gypsum formed from settling into a mass), after- 

 wards neutralizing the portion of the solution taken with ammonia as far as is 

 possible without causing a precipitate to fall." 



Some new forms of apparatus. A. E. Knorr (Jour. Amer. Chem. Soc, 19(1897), 

 No. 10, pp. 817-820, figs. 3). — Illustrated descriptions of an automatic filtering siphon, 

 and a new form of gas generator. 



Some products of the tuberculosis bacillus, E. A. de Schweinitz and M. Dor- 

 set (Jour. Amer. Chem. Soc, 19 (1897), No. 10, pp. 782-785). 



