71G EXPERIMENT STATION RECORD. 



Chhn. Anahjt. el Appl, o {1900), pp. 343-S47).—A letter to the editor by von Garola 

 calling attention, in connection Avith Wavelet's article noted above (p. 713), to Rau- 

 lin's work on tlie t^anie subject.^ 



Tlie electrolysis of copper sulphate as a basis for acidimetry, C. A. Kohn 

 {Join-. Six: cliciii. JikL, 19 {1900), Xo. II, p. 9fJJ). — Tests of this method of preparing 

 a standard acid are rej)orti'd. 



Estimation of nitrites in the presence of nitrates, II. Pellet {^[nn. <'hiin. 

 Anahjt. et Appl., 5 {1900), p. 361; ahs. in Chen). ZUj., 24 {1900), Xo. 92, Repcrl., p. 

 339). — This method depends upon the fact that nitrites in the presence of ferrous 

 salts and acetic acid are broken up, while nitrates are not affected. The total nitro- 

 gen of the nitrites and nitrates is determined by treatment with ammonium-ferrous 

 sulphate and hydrochloric acid, and measuring the nitric oxid. The nitrites are 

 then determined in a second sample by treatment wath ammonium-ferrous sulphate 

 and acetic acid. Or both nitrites and nitrates may be determined in the same sample 

 by first treating with the iron salt and acetic acid, and after reading off the volume 

 of gas, adding hydrochloric acid to decompose the nitrates. 



Estimation of nitrites with nitrates, L. de Koxin'ck {Ann. Chini. Analyt. et Appl., 

 S {1900), p. son; (ilis. In Client. Ztg., 24 {1900), Xu. 92, Repert., p. 339). — In order to 

 determine the nitrates with nitrites, by the method of Pellet, as noted above, the 

 author finds that 30 to 40 cc. of fuming hydrochloric acid should be added. With 

 this precaution the method was found accurate. 



Contribution to the determination of the oxidizable substances in water, 



E. Ruppix {Ztudir. Untersuch. Xahr. u. Genmsmtl., 3 {1900), pp. 676-681; ahs. in Chem. 

 CenthL, 1900, II, Xo. 20, p. 1088). 



The determination of air in water, H. Pellet {Ann. C'khn. Analyt. et A])pl., 5 

 {1900), pp. 369, 370; iibs. in Chem. Centbl, 1900, II, Xo. 20, p. 1089, fig. 1). 



The analysis of sour milk, F. J. Lloyd {Jour. British Dairy Farmers' J.ssor. , 15 

 {1900), pt. 2, pp. 98-105). — By means of a number of series of experiments the author 

 shows the decrease in the total solids of milk after souring. The result corrected by 

 adding one-third of the percentage of lactic acid to the total solids was approximately 

 accurate. This was true for milk 48 hours or 5 weeks old. When the samples con- 

 tained other than lactic acid micro-organisms, the rule did not apply. The author 

 recommends sterilizing reserve samples of milk to overcome the difficulty and i)revent 

 any injustice on a revision of the analysis. 



Nicotin in tobacco, G. d'Utra {Bol. Ayr. Sao Paulo, 1. ser., 1900, Xo. S, pp. 

 138-152). — Determinations of nicotin in samples of a large number of different kinds 

 of tobacco are reported and discussed, and the agricultural applications of nicotin 

 (tobacco extracts) are explained. 



On the presence of invertin and sucrose in grapes, V. INIartixaxd ( Compt. 

 Rend. Aixnl. Sri. J'ari.<^, 131 {1900), Xo. 20, pp. 808-810). 



The estimation of free sulphuric acid in wines, F. Cakpextieki {Staz. Sper. 

 Ayr. Ital., 33 {1900), pp. 307-340). 



The estimation of the dry matter m wine by a specific g-ravity method, 



F. Cakpextieki {Staz. Sper. Ayr, Ital, 33 {1900), pp. 341-356). 



The adulteration of olive oils, W. K. Ferrein {Farmazeft, 7 {1900), p. 1007; 

 ahs. in Chem. Xty., 24 {1900), Xo. 92, Repert., p. 339).— The. substances used in adul- 

 terating olive oil are given and the methods of determining the amounts of the 

 adulterants. 



On the simultaneous occurrence of saccharose and gentianose in the fresh 

 roots of gentian, E. Bourquelot and H. Herlssey {Compt. Rend. Acad. Sri. Rarix, 

 131 {1900), Xo. 19, pp. 750-752). 



Production of nitric acid from air by means of the electric flame, A. 



1 Compt. Rend. Acad. Sci. Paris, 110 (1890), p. 289. 



