514 EXPEKIMENT STATION EECORD. 



application of the various methods for estimating lactose by Fehling's solution 

 or modifications thereof. 



The saccharimeter scale and the means of its verification, C. A. Browne 

 (Abs in Science, n. ser., 32 (1910), No. 823, p. -^75). — After discussing the vari- 

 ous standards of saccharimeter scales, the methods for verifying the scale divi- 

 sions of the saccharimeter by means of quartz plates, the control tube, and 

 chemically pure sucrose are described. A recalculation of the sucrose value of 

 the scale was made with Landolt's formula, the results of which show that the 

 greatest error due to change of concentration is only 0.01°V., indicating that 

 Schmitz' figure, 0.08, is wrong. The maximum error in graduation due to faulty 

 quartz plates did not in any instance exceed 0.05° V. 



" The relation between the French and German normal weights for sucrose 

 according to measurements made upon a Laurent ' plaque type ' was 26 gm. 

 to 16.29 gm., which agrees with the weights oflicially prescribed in Germany 

 and France." 



Invert sugar and its significance for seed beet polarization, H. Plahn- 

 Appiani (BJ. Zuckcrriibenbau, No. 11, pp. 277-282). — The author states that the 

 polarization must be taken as the index for beets in feed beet culture, and that 

 the results of the determination of the dry substance should only be considered 

 a secondary index in beet selection. The polarization and dry substance rarely 

 run parallel, and the latter has a tendency to cover up the saccharose decompo- 

 sition products instead of detecting them. Neither methods can be recom- 

 mended for judging the beets in the fall. 



The separation and estimation of aspartic and glutaminic acids, T. B. 

 Osborne and L. M. Liddle (Amer. Jour. Physiol., 26 (1910), No. 6, pp. Jt20- 

 425). — This is a study of methods, and has particular reference to the quanti- 

 tative separation of glutaminic and aspartic acids from leucin. An improved 

 method for this separation is given. 



Note in reg'ard to determining creatinin, P. Ron a (Biochem. Ztschr., 27 

 (1910), No. 4, p. 3Ji8). — The author states that ferric hj^droxid may be 

 advantageously employed for removing the proteins in blood solutions in the 

 determination of creatinin according to the Folin method (E, 8. R., 17, p. 165). 

 Worli is also in progress to determine the fitness of this reagent for meat 

 extracts. 



Testing milk and its products, E. H. Fareington and F. W. Woll (Madison, 

 Wis., 1911, 20. ed., rev. and enl., pp. YI+297, pi. 1, figs. 6J).— This is the twen- 

 tieth revised edition of this work (E. S. R., 9, p. 690). 



Unification of methods for milk analysis, A. J. J. Vandevelde (Rev. G4n. 

 halt, 8 (1910), No. 16, pp. 371-378).— This consists of material presented before 

 the section of bromatology of the International Congress of Applied Chemistry, 

 London, 1909, and largely noted from another source (E. S. R., 23, p. 113). 



About the estimation of lactose in milk, Bouin (Rev. G6n. Lait, 8 (1910), 

 Nos. 9, pp. 193-201; 10, pp. 230-236; abs. in Rev. G6n. Chim., 12 (1910), No. 18, 

 Repert., p. 365). — A formula is presented for the correction of the error which 

 is introduced during the process of clarifying milk for sugar estimation, and 

 due to the volume of the pi-ecipitate. 



The detection of added water in milk, H. C. Lythgoe (Mo, Bui. Bd. Health 

 Mass., n. ser., 5 (1910), No. 10, pp. .^19-^26). — The following conclusions are 

 drawn from this work, which continues studies previously noted (E. S. R., 

 23, p. 12) : 



" The indirect calculation of milk sugar serves to indicate whether or not 

 a sample of milk is pure, skimmed, or watered. If the proteins exceed the fat, 

 the sample has been skimmed. If the copper serum has a refraction less 

 than 36, a specific gravity less than 1.0245, or solids below 5.28 per cent, added 



