BIBLIOGRAPHY OF LITERATURE. 1001 
The permanganate is standardized with oxalic acid. Acc&rding to Neubauer, 63 
grams ¢rystallized 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 
chem. 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 sulphurie acid and titrated with permanganate. Bul. 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 
intannin estimations. He did not publisha definite method. Compt. Rend., 
46, 577; Ding. poly. Journ., 118, 209. 
Mov.tuapE, 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. 
MU.Lier, 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. 
Pavesi and Roronpi. A modification of Fleck’s method, employing asolution of cop- 
per acetate withammonium carbonate. Theauthors consider the precipitate 
to have the formula C,,H,Cu,(NH,4)20, + H2 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. ‘Traité de 1’ Impression des Vissus, 1, 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. Bul. Soc. Chim. de Paris, 41, 32; Zeitsch. f. anal. Chem., 
24, 273. é 
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. 11, 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 coloris 
discharged in the presence of unprecipitated tannin.- Bul. Soc. Chem. [2], 
21, 169; Jsb. d. Chem., 1874, 1034. 
