16 EXPERIMENT STATION RECORD. [Vol.40 



A modification of the method is described for determining the coprosterol in 

 feces. 



Methods for the determination of phosphoric acid in small amounts of 

 blood, W. R. Bloor {Jour. Biol. Chem., 36 (1918). Xo. 1. pp. 33-18).— The meth- 

 ods described consist of extensions of a method previously reported (E. S. R., 

 35, p. 166), and are based on the nephelometric use of Kober and Egerer's modi- 

 fication (E. S. R., 34. p. 409) of the strychnin molybdate reagent of Pouget 

 and Chouchak. In the work reported this reagent is modified with the object 

 of making it stronger and lessening the manipulation required for producing the 

 precipitation. Detailed descriptions are given of the reagents employed and 

 the manipulation of the method as applied to the determination of total phos- 

 phates, lipoid phosphoric acid (lecithin), and add-soluble phosphoric add in 

 whole blood, plasma, ami corpuscles. 



A new volumetric method for the determination of uric acid in blood. L. J. 

 Cubtman and A. Lkhkman (Jour. Biol. Chem., M {1918), So. 1. pp. 7.57-/70). — 



The method described com ssentially of the precipitation of the nric add by 



means of nickel acetate in a solution made alkaline with BOdium carbonate and 

 the estimation of the uric acid in the precipitate by means of a dilute solution 

 of iodin. 

 The method is said to have given good results with aqueous solutions of uric 



acid as well as with blood serum to which known amounts of uric add were 

 added. It is considered to be fully hn accural.' as the colortmetric method and 

 to possess the advantage of requiring no special apparatus. 



The color laboratory of the Bureau of Chemistry. A brief statement of its 

 objects and problems. II. I ». GlHBS (Jour, Indus, and F.nain. Chem., 10 {1918}, 

 No. 10. pp. 892, 898). — A brief statement is given of the objects and problems 

 Of the color laboratory of the Bureau Of Chemistry of the 1*. S. Department of 

 Agriculture. The laboratory studies are divided into live dasses procesi 

 dye Intermediates, dyes, medlcinals, and analytical methods. Plant operations 

 include the development of a process of manufacture of phthallc anhydrid, the 

 chlortnation of toluene, and Investigations tor the manufacture of various 

 alcohols ami acetone. 



Photographic sensitizing dyes: Their synthesis and absorption spectra. 

 L. E. Wise and E. (}. Anaxa {Jour. Indus, and i-'.noin. Chun., to {1918), Wo. 10, 



pp. 891, 882). 



Natural dyestuffs: An important factor in the dyestuff situation. 1 

 Chapih {Jour. Indus, mni Bnoin. Chem., 10 {1918), No. 10, pp. 795 798). This 

 Ls a brief review of fundamental facts relating to natural dyestuffs, With particu- 

 lar reference to logvi L 



The manufacture, use, and newer developments of the natural dyestuffs, 

 <\ R. 1>i i am v {Jour. Indus, and l.nain. Chun.. 10 {1918), No. 19, /</». 79i 891). — 



This is a general discussion of the subject. 



Production of acid phosphate from creamery waste sulphuric arid. K. 11 

 Cars {Jour. Dairy Bel., t {1918), No. 8, i>i>- 898-511). — The author suggests the 

 utilization of creamery waste sulphuric acid for the manufacture of acid phos- 

 phate. The waste add from the mixture of .ream and acid, after the comple- 

 tion of the tests and the removal of fat. had approximately the following com- 

 position by weight : Sulphuric acid (sp. gr. 1.1') 27.82 per cent, nitrogen (amino 

 acids, peptones, etc i 0.064, ash (potassium, calcium, etc.) o.n. volatile organic 

 matter •».."<".. and sugar i lactose i 0.525. it Is suggested that the acid l.c con- 

 centrated t" 80 per cent acid and mixed with an equal weight of ground rock 

 phosphate. An acid phosphate prepared in this way had the following percent- 

 age composition: Potassium sulphate 0.857, add phosphate 14, and nitre. 

 as ammonia 0.232, The principal Impurities present in the add ate compounds 



