082 EXPERIMENT STATION RECORD. 



tests of the Wijs method of determining the iodin vahie of oils and fats are reported. 

 This method is considered as having many advantages over that of Iliibl, chief 

 among which is the great stability of the solntion used. The procedure is ])racti- 

 cally the same in the 2 methods. The iodin values of a number of oils determined 

 l)y the Wijs method are given. 



Determination of boric acid in margarin, A. Beythien {Ztschr. Untersuch. Nahr. 

 u. Genusmntl, 5 {1902), No. 16, p2>. 76'-^-76v;).— From 50 to 100 gm. of margarin is 

 well shaken with 50 cc. of hot water and filtered through a dry filter. The filtrate, 

 of which 40 cc. can usually be obtained, is neutralized with deci-normal sodium 

 hydroxid, phenol-phthalein being used as an indicator. After the addition of 25 cc. 

 of glycerol the titration is i-ompleted. 



Determination of alcohol in very dilute solutions, G. Argenson {Bui. Soc. 

 Chim. Paris, 3. ser., 21-28 {1902), No. lS-19, pp. 1000-1003) .—In the colorimetric 

 method given, the alcohol is converted into aldehyde and a few drops of an aqueous 

 solution of fuchsin decolorized with anhydrous sulphuric acid is added when a violet 

 colo)' appears. An ajipreciable coloration is obtained in solutions containing orig- 

 inally 1 part of alcohol in 10 million by volume. 



Observation on the occurrence and properties of cholin, II. Struve {Ztschr. 

 Analyt. Clwm., 41 {1902), No. 9, pp. 544-5.50). — This article deals with the occurrence 

 of cholin in grapevine sap and in tartar, and also with the quantitative estimation 

 of cholin. 



On the determination of carbon monoxid and carbon dioxid in vitiated air, 

 F. Jeax {Cornpt. Rend. Acad. Sri. I'ari.^, l.i.'> (1902), No. 18, jij>. 74'>-748).—\ simple 

 automatic apparatus for this purpose is described. The apparatus consists essen- 

 tially of 3 connected flasks, through which the air is drawn. The tir.st is closed 

 with absorbent cotton and filled with sulphuric acid to filter the air and remove dust 

 particles and volatile organic matter; the second contains dilute potash or soda solu- 

 tion (colored with Poirrier Blue, C^B) to remove carbon dioxid; the third, palladium 

 chlorid or ammoniacal silver nitrate, which is decomposed by carbon monoxid and 

 thus furnishes a measure of the quantity of this gas present. Knowing the quantity 

 of each gas required to cause the characteristic reaction with the solutions used 

 (change of color in the alkaline solution and metallic deposit in case of the pal- 

 ladium or silver solution), and measuring the amount of air which it is necessary 

 to draw through before the reaction is brought about, it is easy to I'alculate the pro- 

 portions of carbon monoxid and dioxid present. 



Observations on the analysis of atmospheric air, O. Rebuffat ( Gaz. Chim. 

 Ital, 32 {1902), II, pp. 153-157; abs. in Chem. Centhl, 1902, II, No. 23, p. 1390).— 

 Methods used in examining the air over fields fertilized with night soil are described. 

 Miscellaneous analyses, M. E. Jaffa ( California Sta. Rpt. 1899-1901, pi. 2, pp. 

 235, 236). — This includes analyses of gluten flour, wheat, Wheatine, fruit-i>reserving 

 liquid, peat, yadoo fiber, meat meal, blood meal, and fish refuse. 



International catalogue of scientific literature. D — Chemistry {Inlernat. 

 Cat. Sci. Lit., 2 {1902), pt. 1, pp. 468). — This catalogue is being prepared by a cen- 

 tral bureau in London under the directorship of H. F. Morley and by 29 regional 

 bureaus in different countries. The supreme control of the catalogue is vested in an 

 international convention, to meet in London in 1905, 1910, and every tenth year 

 thereafter. In the interval between successive meetings the administration is vested 

 in an international council consisting of one representative from each regional 

 bureau. The plan adopted provides for author and subject indexes for the different 

 branches of science, which have been arranged in 17 groups. This volume, for 

 which E. Goulding is referee, is an incomplete index of the literature of chemistry 

 during 1901, the imblication of the second part of the volume being promised in a 

 few months. 



Chemicals and allied products, C \\. Munroe and T. M. C'hatakd {TiiHflh 



