AGRICULTURAL CHEMISTRY AGROTECHNY. 411 



Colloid chemistry and the soil, II. Gedroiz (Zeiitbl. Agr. Chcm., 38 {1909), 

 A"o. 7, 1)1). 'i33-.'i3o). — Tbe author seeks to- explain some of the phenomena which 

 occur in soils by colloid chemistry. 



Neubauer's method for potash, B. Schmitz (Chcm. Ztg., 33 (1909), No. 

 127, pp. 1127, 1128). — A comparative study of the methods of Fresenius' abbre- 

 viated method and that of Neubauer's (Fiukener's old method). The Neubauer 

 method is considered very accurate, to have none of the cumbersomeness of the 

 sulphuric acid method, and to have the further advantage of saving platinum 

 chlorid. 



Determination of phosphoric acid in mineral phosphates, G. Jokgensen 

 (Analyst, 34 (1909), No. 402, pp. 392, 393; ahs. in Jour. Soc. Chcm. Indus., 28 

 (1909), No. 19, pp. 1052. 10.53). — A description of the method used in Denmark 

 as official. 



The detection and determination of lead in drinking water, G. Pinchbeck 

 (Pharm. Jour. [London], 1,. scr., 29 (1909), No. 2406, p. 663). — A description of 

 the qualitative and quantitative methods for lead in drinking water. 



Food inspection and analysis, A. E. Leach (Neic York and London, 1909. 

 2. erf., rci: and enh, pp. XVIIl+Do',. pis. 40, figs. 120).— This work ( E. S. R. 16 

 p. 488) has been revised and brought up to date by the addition of new material 

 by A. L. Winton. The chapter on flesh foods has been rewritten and the pro- 

 tein nomenclature of the American Physiological Society and Society of Biologi- 

 cal Chemists has been added. 



Modified combustion bomb for calorimetric and analytical purposes, H. 

 Lanubein (Chcm. Ztg., 33 (1909), No. 119. pp. 1055, I05ti, figs. 2).— The modifi- 

 cation consists of the substitution for the inner platinum or enamel lining 

 of the bomb of enamel cups which can be easily rei)lenished when worn out. 

 The heat equilibrium is established in about 4 minutes, as in the Bertholet 

 calorimeter. 



Determination of phosphorus in organic substances by the bomb calorim- 

 eter, P. Lemoult (Compt. Rend. Acad. Sci. [I'aiis], 149 (1909), No. 11, pp. 

 511-513). — If a substance like auilin phosphate, triphenyli)hosphine, etc., is 

 placed within the bomb in a porcelain dish coated with potassium nitrate, a 

 complete oxidation of the carbon and phosphorus is brought about. The water 

 which is at the bottom of the bomb dissolves the phosphoric acid thus formed 

 and it may be determined by precipitation as ammonium magnesium phosphate. 



Methods for the quantitative chemical analysis of animal tissues, W. 

 Koch et al. (Jour. Amcr. Chcm. Soc, 31 (1909), No. 12, pp. 1329-1355).— A 

 series of papers discussing physiological chemical methods. 



Variations observed in the composition of lard, E. Durier (Ann. Falsif., 

 2 (1909), No. 13, pp. 489-493, fig. 1). — A discussion as to the influence of such 

 factors as the feeding of the animal, the parts of the carcass from which the fat 

 was taken, and the methods of extraction (water bath and direct fire) and 

 deodorization, upon the ultimate results obtained on analysis. Analytical re- 

 sults ai-e given. 



Examination of flour, E. Schaffnit (Ztschr. Untersuch. Nahr. u. Genussmtl., 

 17 (1909), No. 2, pp. 86-88, fig. 1; ahs. in Chcm. Ztg., 33 (1909), No. 128, Re- 

 pert., p. 549, fig. 1). — An apparatus is described with which the microscopical 

 examination and the Benecke color test can be carried on simultaneously. 



Judging' flour by its catalase content, P. Liechti (Chcm. Ztg., 33 (1909), 

 No. 119, pp. 1057). — The author found that the quality of a flour can be easily 

 .judged by the amount of oxygen it liberates from peroxld of hydrogen. As the 

 branny portion of the seed or kernel has the greatest catalytic action, flour 

 high in bran can be detected. See also a previous note by Wender (E. S. R., 17, 

 p. 996). 



