820 EXPERIMENT STATION RECORD. 



plan of the investigation are discussed, and a description is given of the 

 various methods which have been proposed for the separation of proteid 

 matter in animal products, with investigations of these methods. 



"By a happy modification of the phospho-tungstic acid method he has greatly 

 improved this process, and shown how a practical separation of the flesh bases from 

 the other nitrogenous substances can be effected by this reagent. The flesh bases 

 are to some extent precipitated by the new form of the reagent proposed by Professor 

 Mallet, but they are brought into a soluble state by the addition of water and heat, 

 so that a practically complete separation of them is effected. This process, together 

 with the use of tannic acid for the separation of peptones, leaves little to be desired 

 in securing a practically complete separation of the nitrogenous matters." 



In the second part H. W. Wiley describes in detail the method of 

 separating proteid bodies from the flesh bases by the use of hot water 

 followed by chlorin or bromin, which has recently been investigated in 

 the laboratory of the Division of Chemistry and applied in a series of 

 analyses of flesh products. The application of the bromin method 

 to commercial meat extracts is discussed, and the factors for the calcu- 

 lation of total nitrogen are considered. 



Investigations on the effect of the quality of the ether on the 

 results of fat determinations in feed stuffs, T. Methner (Chem. 

 Ztg., 23 (1899), N~o. 5, pp. 37, 38). — Results are given which were obtained 

 with the' use of (1) ether purified by metallic sodium in the prescribed 

 way, (2) ether thus purified plus varying amounts of absolute alcohol, 

 and (3) ether which had been allowed to stand over caustic lime for 3 

 weeks and then distilled. The author concludes from these results that 

 alcohol, in the amounts used, has no considerable influence on the 

 amount of extract obtained, and that ether, purified by caustic lime, is 

 pure enough for practical purposes. — J. t. Anderson. 



A condenser for extraction work, O. G. Hopkins (Jour. Amer. 

 Chem. floe, 20 (1898), JVb. 12, pp. 965, 966, fig. J).— This condenser has 

 the water tube inside, instead of in the usual form of a jacket, both the 

 inlet and outlet being at the top of the condenser and the inlet tube 

 extending to the bottom of the water tube. It is intended for use in 

 fat extraction apparatus in place of the ordinary condenser, " mainly 

 to avoid the constant trouble of having atmospheric moisture condense 

 upon the outer surface . . . and run down over the extraction appa- 

 ratus." The condenser may also be used in ordinary distillation and is 

 less likely to break than the ordinary condenser. 



Researches on chemistry and physiology, applied to agriculture, A. Peter- 



mann (Becherch.es de chemie et pliysiologie, ajyjjlique'es a V agriculture. Brussels : <>. 

 Mayoly and J. Audictre; Liege: C. Desoer ; Paris: G. Masson, 1898, vol. 3). 



Text-book of physiological chemistry, O. Hammarsten (New York: John Wiley 

 <T Sons, 1898, pp. 705). — Authorized translation from the third German edition by 

 J. A. Mandel. 



The estimation of manganese by means.of potassium permanganate, P. W. 

 Daw (Chem. Neivs, 79 (1899), No. 2043, p. 25).— See also note by H. Bearley in Chem. 

 News, 79 (1S99), No. 2044, p. 47. 



