108 EXPERIMENT STATION RECORD. 



excellent results and consumes no more time than either alone. The caustic 

 alkali method for alumina is superior to the thiosulphate in point of accuracy 

 in the hands of the inexperienced." 



Methods for the determination of sulphurous acid and soot in air, Hur- 

 DELBKiNK {Hvlir. Fhtjs. OkOHom. Gesell. Konigsb., 48 (1901), j)p. 145-150, fig. 1).— 

 The construction and operation of an apparatus for this purpose, which con- 

 sists essentially of an asbestos filter for the removal of the soot, an absorber 

 containing iodin solution for the collection of the sulphurous acid, and a device 

 for measuring the volume of air drawn through the apparatus, are described. 

 The successful use of the apparatus in the examination of a number of samples 

 of air is reported. 



A rapid method for determining carbon dioxid in the atmosphere, S. H. 

 Davies and B. G. McLellan {Jour. Soc. Vhem. Indus., 2S {1909), No. 5. pp. 

 232-234). — This is a modification of the minimetric method proposed by Angus 

 Smith and perfected by Lunge and Zeckeudorf. which is based upon the meas- 

 urement of the air required to saturate the reagent used for the absorption of 

 carbon dioxid. The principal modification consists of the substitution of a 

 pump for the rubber bulb used in the original method, thus securing a more 

 accurate measurement of the amount of air employed. 



Polarimeti-ic methods of estimating starch, E. Powers {Ztschr. Offentl. 

 Chem., 15 {1909), No. 1, pp. 8-14)- — A digest of data on the subject of estimat- 

 ing starch. The paper is followed by a discussion. 



A polarimetric method of determining starch in barley, F. Schubert 

 (Osterr. Ungar. Ztschr. Zuckerindus. u. Landw., 38 {1909), No. 1, pp. 11-31). — 

 Experiments conducted with a view to devising a polarimetric method for the 

 determination of starch in barley are reported, and the results obtained by the 

 author and other investigators are tabulated and discussed. A description of 

 the necessary apparatus is also given. 



Comparative experiments on the practical value of the precipitin reaction 

 and the complement union method for identifying horse flesh, O. Weidanz 

 and K. Borchmann {Arh. K. Gsndhtsamt., 28 {1908), No. 3, pp. 477-497).— 

 From the experimental data reported the conclusion was reached that the 

 biological method is the only satisfactory one for practical work along the line 

 indicated. 



Technique of the biological method for determining horse flesh, Uhlen- 

 HUTH, Weidanz, and Wedemann {Arb. K. Gsiidhtsauit.. 2S {1908). No. 3, pp. 

 449-476, figs. 8). — A digest of data and an extended description of this labora- 

 tory method are given. 



The identification of artificial coloring matter in sausage skins, T. Merl 

 {Pharm. ZentralhaUe, 50 {1909), No. 11, pp. 215-217).— An adaptation of the 

 Polenski method for detecting artificial coloring matter is described which is 

 suitable for use with small quantities. 



Method of estimating essential oil in liqueurs, L. Vandam {Bui. Soc. Chim. 

 Belg., 22 {1908), No. 7, pp. 295-300).— \ comparative study of the method 

 which the author iiroposes. 



The determination of essential oil and alcohol in flavoring extracts, 

 J. HoRTVET and R. M. West (Jour. Indus, and Engin. Chem., 1 {1909), No. 2, 

 pp. 84-95, figs. 2). — An extended study of methods. 



New state laboratories for suppressing frauds, G. A. Le Roy {Separate 

 from Bill. Soc. Indus. Rouen, 36 {1908), No. 1, pp. 98). — Municipal laboratories 

 are described, the text of the French pure-food law of 1905 is quoted, and official 

 methods are given. 



Practical guide for the analysis of milk, J. M. and P. Perkin {Guide 

 Pratique pour VAnalyse du Lait. Paris, 1909, pp. yiI+344, figs. 14O). — This 



