310 EXPERIMENT STATION EECOED. 



The determination of saccharose in condensed milk, H. Nowak (Ztschr. 

 Analyt. Chem., 51 {1912), No. 10-11, pp. 610-614; abs. in Chem. Ztg.. S6 {1912), 

 No. 132, Repert., p. 593). — The author finds that JoUes' method (E. S. R., 24, 

 p. 704) can be used for the determination of saccharose in condensed milk. 

 The solution must not contain more than 1.5 per cent of lactose. 



Detection of small amounts of coconut fat in butter, L. Robin {Orig. Conv- 

 mun. 8. Intemat. Cong. Appl. Chem. [Washington and New York], 18 {1912), 

 Sect. VIIIc, pp. 305-801; aJ)s. in Chem. Ztg., 36 {1912), No. m, pp. 1311, 1312).— 

 The saponification number of the fatty acids contained in coconut fat is much 

 higher than that of butter, so that the author finds it impossible to detect 

 thereby as little as 5 per cent of coconut fat in butter. The determination of 

 the water soluble and insoluble fatty acids, however, will give more satisfactory 

 results. 



If the saponification number of the butter is designated as A, the amount of 

 acids soluble in water as B, the saponification number of the acids soluble in 

 water as a, and the acids insoluble in water as 6; and the ratios A:B=R and 

 a:l)=r are determined, the R of pure butter is less than r. If an addition of 

 5 per cent of coconut fat is made to butter, R will be greater than r; 6 and B 

 can be easily determined by the author's method. 



Proposals for the unification of analytical methods for cheese. — II, De- 

 termination of water in cheese, C. Mai and E. Rheinbergeb {The Hague: 

 Study Com. Intemat. Dairy Fed., 1913, No. 2, pp. 11, fig. 1).—A translation of 

 the article previously noted (E. S. R., 28, p. 612). 



The quantitative determination of methyl alcohol in mixtures containing 

 ethyl alcohol, especially in brandies, W. Koenig {Chem. Ztg., 36 {1912), 

 No. 109, pp. 1025-1027, fig. 1). — This is a modification of T. E. Thorpe's and 

 I. Holmes's oxidation method (sulphuric acid and bichromate of potash), and 

 it makes use of J. Konig's apparatus, which is employed for determining 

 carbon dioxid, especially in organic carbon. 



The estimation of rice spelts (hulls) in feeding stuffs, A. Gkete {Ais. in 

 Chem. Ztg., 36 {1912), No. 88, p. 8^2). — The silicic acid method alone for deter- 

 mining whether feeding stuffs contained rice hulls (E. S. R., 24, p. 310) was 

 found unreliable. The crude fiber determination can be used in connection 

 with it, but the results obtained are not always entirely satisfactory. As the 

 latter procedure is very tiresome, it is proposed to simplify the method by 

 using the figures obtained from the residue which remains after boiling the 

 material with ammonia. In this case it is necessary to know the average 

 residue yielded by feeding stuffs of known composition (mixtures, etc.). For 

 example, if the residue of rice spelts which has been leached with ammonia 

 is 75.5 per cent, and the residue of a rice feed meal, treated in the same manner, 

 is 25 per cent, the formula is Z+Y=S (substance), and X.0.25+y.0.755=i2 

 (weighed residue). 



About the various methods employed for determining nicotin in tobacco 

 and tobacco extracts, J. Toth {Chem. Ztg., 36 {1912), No. 99, pp. 937, 938).— 

 The author finds that the method devised by Bertrand and Javillier (E. S. R., 

 27, p. 14) can be used for determining the nicotin in tobacco or in tobacco 

 extracts, and is of particular value where ammonia and pyridin are present. 

 Its disadvantage lies in the fact that it is expensive to conduct and cumber- 

 some. In this regard the author does not agree with Chapin (B. S. R., 25, 

 p. 16). 



The determination of nicotin in concentrated tobacco juices, F. Pobchet 

 and P. ToNDTJz {Abs. in Chem. Ztg., 36 {1912). No. 88, p. 843). — A comparative 

 study was made between the Ulex method (E. S. R., 25, p. 211), and the Biel 

 and Toth methods. 



