524 EXPERIMENT STATION RECOED. 



ally by titration. A stream of carbou-dioxid-free air saturated with metliyl 

 alcoliol vapor is drawn slowly througli the distilling flask during the operation. 

 The details of the method are illustrated and comparative analyses reported 

 which show that it is accurate. 



Factors which influence the creatinin determination, F. C. Cook (Jout: 

 Amcr. Vhciii. Soc, 31 (.1909), No. 6, pp. 673-693). — A critical study of methods. 



Chemistry of animal feces. II, The determination of fatty matter in 

 animal feces by ether and carbon tetrachlorid, A. D. Emmett (Jour. Amer. 

 Vhcin. Soc, 31 (1909), No. 6, pp. 693-695). — The extraction with ether is less 

 complete than with carbon tetrachlorid. The differences in the phosphorus con- 

 tent of the two extracts the author considers too small to be of any special 

 significance. 



"An approximate analysis of the material which was found to be insoluble in 

 ether but soluble in carbon tetrachlorid, showed that it contained 0.1S5 per cent 

 of nitrogen, 10.11 per cent of mineral matter, and 9.12 per cent of calcium, as the 

 oxid. Other solubility tests were made upon this ether-insoluble substance and 

 it was found to be insoluble in carbon disulphid, benzene, acetone, alcohol, and 

 a mixture of alcohol and acetone. Tests for proteins and bile salts were negative. 



" The nature of this difference iu the action of the two solvents, carbon tetra- 

 chlorid and ether, is being studied further." 



The determination of urea in urines, P. A. Levene and G. M. Meyer (Jour. 

 Amer Chem. Soc, 31 (1909), Xo. 6, pp. 717-722).— A comparative study of 

 methods. 



" The results obtained indicate that the accuracy of the urea estimation is not 

 impaired by the addition of phosphotuugstic acid. Uric acid and creatinin are 

 practically completely precipitated by phosphotuugstic acid, and that which re- 

 mains in solution is not sufficient to appreciably affect the urea values." 



The preservation of urine by thymol and refrigeration, F. W. Gill and 

 H. S. Grindley (Jour. Amer. Chem. Soc., 31 (1909), No. 6, pp. 695-710).— The 

 authors state that the investigation reported clearly demonstrates " that the fol- 

 lowing urinary constituents, namely, chlorin, phosphorus, total sulphur, inorganic 

 sulphur, total nitrogen, and urea nitrogen cau be determined ip the composite 

 samples of normal urines which have been preserved with thymol and refrigera- 

 tion for periods of 4, S, IG, and 32 days, with as much accuracy and just as satis- 

 factorily, giving practically the same values, as they can be estimated in the 

 fresh daily samples of the urines. [The same is true for uric acid in composite 

 samples preserved for periods of 4, 8, and 16 days.] 



" The results of this study are not conclusive as to the influence of the preser- 

 vation herein described upon the organic sulphur, the total acidity, and ammonia 

 nitrogen determinations. . . . 



" Under the conditions attending the collection, compositing, and preservation 

 of the urine in this work, the quantitative changes which the creatinin content 

 of the urine undergoes are insignificant." 



[Miscellaneous analyses], P. Andouard (Bui. Sta. Agron. Loirc-Inf., 1907-8, 

 pp. 7-7,5).— Analyses are reported of foods, feeding stuffs, fertilizers, and other 

 agricultural substances. 



Report of the chemical control and seed control stations at Christiania, 



1908, S. Hals (Ber. Stat. Kem. Kontrolstat. og Frokontrolunst. [Christiama], 



1909, pp. 5It). — The report contains the usual condensed account of the results 

 of analytical work during the year. In all 6,.39S different sami)les of agricul- 

 tural products were examined during the year in the chemical laboratory and 

 4,270 samples of seeds in the seed laboratory. 



[Miscellaneous analyses], R. D. Watt (Transcaal Dcpt. Agr. Ann. Rpt. 

 1908, pp. 268-271).— Analjms are reported of wattle barks, ijeanut cake, pearl 



