908 EXPERIMENT STATION RECORD. 



Methods for the examination of milk, P. Sommerfeld, translated l)y A. T. 

 Petkks and K. S. Hiltner {Chicago: A. Eger, 1901, pp. 96, figs. 7). — This little vohime 

 is designed for the use of commercial analysts, inspectors, and health officers. It 

 describes methods for the complete analysis of milk, detection of preservatives, 

 detection of adulteration, estimation of insoluble foreign substances, examination of 

 condensed milk, and the bacteriological examination of milk. The translators have 

 followed closely the German edition, which undoubtedly accounts for the presence 

 of some methods which are no longer employed in this country and the omission of 

 others which are in common use. In other words, the book has been translated 

 literally rather than adapted to American readers, although fortunately several foot- 

 notes, including one describing the Babcock test, have been added by the translators. 

 An appendix contains a short bibliography. 



The estimation of milk sugar in milk by polarization and by reduction, 

 A. ScHEiBE (Z^s■^^;■. Aiialyt. Chem.,40 (1901), No. 1, pp. 1-14). — In acomparison of the 

 two methods the authoi found average higher results by polarization. In order to 

 correct this he proposes multi})lying the results obtained liy polarization by the fol- 

 lowing factors: Forwhole milk, fat content 2.8 to 4.7 per cent, 0.94; skim milk, 0.97. 

 No factor is recommended for cream or colostrum. 



The testing of milk for carbonate and bicarbonate of soda, P. StJss (Pliarm. 

 Ceiitralhal/e, 1900, No. 41, PP- 4'>5, 400; ahi<. in Zti^clir. Untermch. Nahr. u. Genussmtl., 

 4 {1901), No. J, p. 7S). — By adding 5 to 10 cc. of a 0.2 per cent alcoholic solution of 

 alizarin to 100 cc. of milk a rose color will be produced in the presence of 0.05 to 0.1 

 per cent of carbonates of soda. In their absence only a light yellow color will result. 



A new process for detecting sesame oil in vegetable and animal oils, 

 Tamhox {Jour. PJioriii. et Chi)n., 6. ser., IS {1901), No. 3, pp. 57, 5S). 



Simple tests of the action of zymase, R. Albert {Ber. Deut. Chcm. (icselL, S3 

 {1901), No. 19, pp. Sn, 5-3778). 



On the question of the inversion of cane sugar, E. O. vox Lippmann {Ber. 

 Dciit. Clinit. (ieaell., SS {1901), No. 19, pp. S500-.i564). 



Analyses of fruit essences, G. Fabris {Ann. Lab. Chim. Cent. flaheUc, 4 {1900), 

 pp. 41-141; <ih><. in. Jour. CJnjui.Sor. [Londonl, SO {1901), No. 468, IT, ]>.49). 



An improved method for the preservation of normal sodium hydrate, E. 

 DowzARD ( Chcm. Netn<, 83 {1901), No. 2146, pp. 18, 19, fig. 1). — The solution is covered 

 in the bottle with a layer of white mineral oil (B. P. 1898) I in. thick. The bottle 

 is connected with a filter pump by which any excess of solution which may have 

 been siphoned off may be sucked back into the bottle. 



The evolution of the thermometer, H. C. Bolton {Easton, Pennsylvania: The 

 Chenucal I'lih/lshing Co., 1900, jiji. 98, fig>:.6). — This little book traces the history of 

 the development of the thermometer from the time of Galileo's invention of his open- 

 air thermometer to the present date. A list of authorities consulted is given. 



An automatic temperature regulator, C. T. Knipi' {I'Jigs. Rer., 12 {1901), No. 1, 

 JIJI. 47-49, figx.S). — This is an electric device for regulating the temperature of an 

 electric heating ap])aratus. 



Asimple thermoregulator, A. von Kalecsinszky {ZtrJir. A)iali/t. Cheni., SO {1900), 

 No. 11, pp. 698, 699). 



An apparatus for the generation of dry hydrochloric-acid gas, A. Gwigc^ner 

 {Ztsrhr. Angew. Chem., 1900, No. 52, p. 1308, fig. I). 



Nevr laboratory apparatus, W. Bersch {'/A><chr. Landv. Yers^\whv\ Ocstcrr., 4 

 {1901), No. 1, pp. 4,fig><. S). — An extraction apparatus with a special form of aluminum 

 capsule and an apparatus for drying in different gases are described. 



New laboratory apparatus, P. Metzcjer {Ztsc.hr. Analyt. Chem., 39 {1900), No. 

 12, pp. 791-794, figs. S). — A titration apparatus and devices for sampling solid and 

 liquid substances are described. 



