CHEMISTRY. 1053 



Applicability of the Schloesing method of determining nitric nitrogen in 

 the presence of organic matter, J'. Lieluti and K. Rittkk {ZttfcJu-. Anah/t. Clicm., 

 43 {1904), No. 3, pp. lG8-n2). — A series of expfrinu'iits witli mixturvs of nitrates 

 and ammonium salts and with urea, urine, and soil, is repurted, which show the 

 accuracy of this method if care is taken to insure the complete expulsion of air from 

 the apparatus. 



A comparison of simple methods of determining carbon dioxid in the air, 

 A. F. Latenstein {Jour. Oclmni. Xarodii. Sdntwija, 15 {1003), p. 422; ah.<<. in Chem. 

 Ztg., 2S {1904), No. 33, Bcjiert. No. 9, p. 116). — Comparisons of the Smith-Lunge, 

 Lun^'e-Zeckendorff, Wolpert, Nagorski-Ssuhbotin, and Pettenkofer methods are 

 reported. The last two gave the most uniform and accurate results. This the 

 author attributes to the more perfect absorption of the carbon dioxid of the air in 

 these methods. For general sanitarj' analysis the Nagorski-Ssubbotin method is 

 preferred on account of simplicity and reliability. A niodiiication of Pettenkofer's 

 method is described. 



Contributions to technical chemical analysis, G. Lunge {ZtKcJir. Anijcio. Chem., 

 17 {1904), No.^. 7, pp. 195-203; 8, pp. 226-236; 9, pp. i'65-;?70).— C-ritical comments, 

 base<l largely upon the results of original work, are made on chemical apparatus, 

 various indicators, and numerous substances recommended for the preparation of 

 standard solutions for use in volumetric analysis. 



A possible source of error in fat determinations by the extraction methods, 

 C. B.\KTHEL {Xord. Mejeri Tidn., IS (1U03), No. 35, ]>i>. 471, 472).— Tht- author tinds 

 that vigorous stirring of skim milk, as occurs in the pasteurization of the milk in 

 some pasteurizing machines provided with stirrers, causes a subdivision of the fat 

 glol)ules; and that on drying the milk on paper, kaolin, sand, etc , the numerous 

 minute globules thus formed can not be dissolved out 1)y the ether, presumably 

 het-ause the surface attraction of the absorbing medium can not 1:)e overcome. 



The Gottlieb method, on the other hand, gives correct results in the case of such 

 milks, the iiercentages beingfrom a])out one-tenth to four-tenths al)Ove those obtained 

 by the Adams method, depending ujxjn the fat content of the milk. The greater 

 differences were observed in case of milk containing considerable quantities of fat. 

 When samples of new milk were churned for 5 to 15 minutes at about 48° C. the 

 results obtained with the separator skim milk by the extraction method were 0.18 to 

 0.44 per cent too low, while the results obtained by the two methods of analysis 

 agreed within 0.01 to 0.04 of 1 per cent when the milk was not subjected to vigorous 

 agitation. — f. w. woll. 



On the quantitative separation of maltose and lactose, C. I. Boyden ( Ver- 

 nxintiSta. Rpt. 190S,pp. i.96'-./6'7 ).— This has been noted from another source (E. S. R., 

 14, p. 225). 



Analysis of formaldehyde sold in North Dakota, E. F. Ladd ( North Dakota 

 Hta. Bui. 60, pp. 386-395). — Analyses were made of a number of samples of commer- 

 cial formalin. The content of formaldehyde was frequently below 40 per cent, and 

 the packages were often short in weight or measure. The average formaldehyde 

 content of a large nund)er of these samples was about 'i'.^ per cent. 



Miscellaneous analyses, C. H. Jones {Vermont Sta. Rpt. 1903, pp. 201-203). — 

 Analyses are reported of .32 samples (jf fertilizing materials, home mixtures, and 

 wood ashes, 3 samples of butter, 1 sample of maple sirup, and 1 of maple sugar. 



Report of the division of chemistry, A. M. Peter {Kentucky Sta. Rpt. 1900, pp. 

 XI-XXXIV) . — During the year 1,211 samples, of which 599 were fertilizing mate- 

 rials, were analyzed. In this report analyses are given of 35 samples of butter, 67 of 

 sorghum-cane juice, 72 of sugar beets, 2 of silicate of potash, 4 of feeding stuffs, 7 

 of soils, 2 of tobacco extract, 5 of tobacco stems and stalks, 3 of potassium nitrate, 1 of 



