314 EXPERIMENT STATION RECORD. [Vol. 41 



marc on Ions-continued extraction, tlie dried and weiglied residue sliould be 

 subjected to fiiitlier extraction with six dilTerent portions of boiling water. 



The critical temperature of solution applied to the analysis of fats, F. 

 OuvABi (Sta^s. Sper. Agr. Ital., 50 {1911), No. 6-S, pp. 365-381, figs. 2; abs. in 

 Chem. Abs., 13 (1919), No. 12, pp. 13J,1, 1348, figs. 2).— The author states that 

 the concentration of the fat in any solution may be considered as if the fat 

 were a single substance and the system studied as if it consisted of two com- 

 ponents, fat and solvent. The conditions of equilibrium in two simple cases, 

 an anilin-tallow system and an acetic acid-tallow system, are illustrated by 

 curves from which the percentage of tallow in the mixture can be determined. 

 The measurements involved can be carried out by fixing either the temperature 

 or the concentration of the fat The last method has had a partial application 

 in the measurement of tiie solubility of oil. 



Tentative standard methods for the sampling and analysis of commercial 

 soaps and soap products, A. Campbell {lour. Indus, and Engin. Chem., 11 

 {1919), No. 8, pp. 785-788). — These tentative methods are presented by the 

 committee of the American Chemical Society on the methods of analysis and 

 specifications of commercial soaps and soap products. For some determina- 

 tions alternative methods are reported for suggestions and criticism prepara- 

 tory to adopting standard methods. 



Some notes on paint analysis, G. J. HorcH {Jour. Indus, and Engin. Chem., 

 11 {1919), No. 8, pp. 767, 768). — Methods devised by the author at the Bureau 

 of Soils, U. S. Department of Agriculture, to meet particular cases in testing 

 paint supplies are outlined. These include the determination of cuprous cop- 

 per in copper paints, a rapid method for lime in white lead, the detection of 

 chromium in mixed pigments, and an improved method for chromium in chrome 

 yellow. A convenient method for the preparation of a starch indicator which 

 will keep indefinitely is also described, in which a dilute solution of salicylic 

 acid is employed as a solvent. 



Acid test on enamel ware, W. D. Collins {Jour. Indus, and Engin. Chem., 11 

 {1919), No. 8, pp. 757-759). — Acid tests were made at the Bureau of Chemistry, 

 U. S. Department of Agriculture, on 51 samples of white, gray, and blue enamel 

 ware from 26 different American manufacturers. 



The test most used was made by boiling 500 cc. of 4 per cent acetic acid in 

 the vessel for 30 minutes. About half of the samples of white and gray ware 

 suffered no loss of glaze on such treatment, while nearly all the blue ware was 

 badly affected by 2 per cent acid. From 34 of the samples antimony was dis- 

 S(dved in amounts of from 0.5 to 2 mg. Lead was found in ware from only one 

 manufacturer. 



The desaccharification of beet molasses with lime by extraction of the 

 sugar juice, Daude {Ztschr. Ver. Dcut. Zuckerindus., 1916, No. ?^.J, II, pp. 370- 

 397, figs. 6; abs. in Chem. Abs., 11 {1917), No. 9, p. 1330).— A. review of patent 

 literature. 



Date pasteurizing and ripening apparatus, A. E. Vinson and C. N. Catlin 

 (Ari::ona Sta. Rpt. 1917, pp. 479, 480). — For several years the entire output of 

 the Tempe Date Orchard has been pasteurized with a small pasteurizer heated 

 by a gasoline brooder heater. A new pasteurizer of wood, recently constructed, 

 is described in detail, together with an improved carbon dioxid rlpener of 

 greater capacity than formerly used. 



Reaction products of alkali-sawdust fusion; acetic, formic, and oxalic acids 

 and methyl alcohol, S. A. Mahood and D. E. Cable {Jour. Indus, and Engin. 

 Chem., 11 {1919), No. 7, pp. 651-655). — An investigation is reported from the 

 Forest Products Laboratory, U. S. Department of Agriculture, of the amount 



