BIBLIOGRAPHY OF LITERATURE. 1001 



The permanganate is standardized with oxalic acid. According to Neubauer, 63 



grams crystallized oxalic acid correspond to 41.57 grams purified gallotannic acid. 



Zeitsch. f. anal. Chem., 16,33; 20, 91. 



MACAGNO. A method based on the use of mercuric nitrate as a precipitant. Ber. d 

 chern. Ges., 7, 1, 360. 



MAUMENE. A method for the estimation of tannin in wines. The tannin is precip- 

 itated by barium hydrate, and the precipitate after washing is dissolved in 

 dilute sulphuric acid and titrated with permanganate. Bui. Soc. Chim. [2], 

 22, 41;* Jsb. d. Chem., 1874, 1046. 



MITTENZWEY. A method depending upon the absorption of oxygen by tannin. A 

 portion of the substance is shaken in a graduated tube with a 30 per cent 

 solution of potassium hydroxide. After standing twenty-four hours the tube 

 is opened under water and the absorption noted. Journ. f. prakt. Chem., 91, 

 81. 



MONIER E. Monier was the first to propose the use of permanganate of potassium 

 in tannin estimations. He did not publish a definite method. Compt. Rend., 

 46, 577 ; Ding. poly. Journ., 118, 209. 



MOULLADE, A. A modification of Jean's method for the estimation of tannin, em- 

 ploying iodine with sodium bicarbonate. Carbon bisulphide is used as an 

 indicator. Journ. de Pharm. et de Chim. [5], 22, 153. 



MILLER, G. An improvement in Davy's method similar to that of Lehman. Wag- 

 ner's Jsb., 1858, 510; Zeitsch. f. anal. Chem., 5, 5. 



OSTERMAYER. This chemist substitutes magenta for the rose aniline in Wagner's 

 method. Chem. News, 40, 181. 



PA VESI and ROTONDI. A modification of Fleck's method, employing a solution of cop- 

 per acetate with ammonium carbonate. The authors consider the precipitate 

 to have the formula CHtt.Cu^NH.OiOa + H s O. Gazz. Chim. Ital., 1874, 194 ; 

 also Ber. d. chem. Ges., 1874, 590. 



PERSOZ, J. Persoz estimated the tannin, employing stannous chloride, by comparing 

 the volume of the precipitate after setting aside from ten to twelve hours, 

 with that obtained under the same conditions as to volume and time with a 

 standard tannin solution. Trait6 de 1' Impression des Tissus, I, 282. 



PERRET, M. Perret employs an albumin solution as a precipitant of tannin, then 

 removes the excess of albumin. The tannin is calculated from weight of the 

 dried precipitate. Bui. Soc. Chim. de Paris, 41, 32; Zeitsch. f. anal. Chem., 

 24, 273. 



PRIBRAM. Based on the precipitation of tannin by lead acetate. The organic mat- 

 ter contained in the precipitate is termed "total astringent matter." Jsb. 

 d. Chem., (1866) 17, 821; Vierteljahresber. f. Chem., 15, 520. 



PROCTER, H. R. A modification of Lowenthal's method (see page 890, this report). A 

 valuable improvement comprised in this modification is the use of powdered 

 kaolin to facilitate the filtration after the addition of the gelatin. Journ. 

 Soc. Chem. Ind., 3, 82. 



PROCTER, H. R. The same as Hammer's method, except that hide powder is used in- 

 stead of the animal skin. Allen's Commercial Organic Analysis, Vol. HI, Pt. 

 1, 119. 



PROCTER, H. R. A criticism of Gantter's method. Procter finds that the amount 

 of permanganate consumed is materially influenced by the excess in which 

 it is added and by the time of boiling. He concludes that by a rigid scheme 

 of operation the new method might give concordant results, but at best such 

 results could have but a comparative value. Journ. Soc. Chem. Ind., 9, 260; 

 Journ. Franklin Inst., 129, 421. 



PRUD'HOMME. A volumetric method employing a standard solution of calcium hypo- 

 chlorite with an aniline color (methyl-orange) as an indicator. The color is 

 discharged in the presence of unprecipitated tannin. Bui. Soc. Chem. [2], 

 21, 169; Jsb. d. Chem., 1874. 1034. 



