BIBLIOGRAPHY OF LITERATURE. 1003 



ployed. In the original article several of the constants for diiferent tannins 

 are given. Chem. News, 55, 168. 



WAGNER. A volumetric method, employing a standard solution of cinchonine col- 

 ored with rosanaline and acidulated with sulphuric acid. Zeitsch. f. anal. 

 Chem., 5, 1. 



WARRINGTON. A volumetric method depending upon the direct precipitation of 

 tannin by gelatin. A filter tube for testing is prepared by loosely introduc- 

 ing a piece of sponge into the end of a small tube. In filtering off a test 

 sample immerse the sponge in the solution, and the clear liquid will rise into 

 the tube. Test this filtrate with gelatin. Phil. Mag., 31, 150; also Journ. 

 Sci., 1848, 6, 112. 



WEISS. Illustrations of apparatus for the continuous extraction of barks, etc. 

 Zeitsch. f. anal. Chem., 28, 114. 



WILDENSTEIN, R. A coloriiuetrio method, employing strips of filter paper of vari- 

 ous shades and comparing them with strips of similar paper after dipping 

 them into the infusion which had been previously treated with an iron salt. 

 Zeitsch. f. anal. Chem., 2, 137. 



WOLFF, E. A method for the estimation of tannin in teas, employing copper acetate 

 as a precipitant. The precipitate, after washing with boiling water, is dried 

 and ignited, moistening with nitric acid. Weight obtained X 1.304 gallo- 

 tannin. Krit. Blaett., 44, 167; Zeitsch. f. anal. Chem., 1, 103. 



ADDITIONAL REFERENCES TO THE LITERATURE OF TANNINS. 



BtiCHNER. Tannin estimations, criticisms on. Jsb. d. Chem., 18, 862 (1867) ; Dingl. 



polyt. Jour., 184, 250, 330. 

 CARLES, P. Tannin, gelatin solution for estimating. Chem. News, 51, 297; Zeitsch f_ 



anal. Chem., 24, 272 (1885). 

 ETTI, C. Tannic acid, composition of. Chem. Ceutrbl., 1880,204; Jsb. d. Chem., 



1880, 898. 



FRANK. Tannins, estimation of. Pogg. Ann., 43, 161. 

 FRAAS. Tannin, improvement on Miiller's method. Zeitsch. f. anal. Chem., 5, 5; 



Ergebnisse landwirthsch. und agri. chem. Versuche, Munich, (1861), 3, 41. 

 FREDA, P. Tannic acid, constitution of. Gazz. Chim. ital. 8, 9. 



GAUHE, F. Tannin, comparison of various methods. Zeitsch. f. anal. Chem., 3, 122. 

 GRIESSMAYER, V. Tannin, detection of. Zeitsch. f. anal. Chem., 1872, 43; Jsb. d. 



Chem., 1872, 903. 

 HALLWACHS, W. Tannin, criticisms on methods. Zeitsch. f. anal. Chem., 5, 231; N. 



Jhrb. f. Pharm., Bd. 25, 2, 68. 



HILL, ALFRED. Tannin, estimation of, in tea. Analyst, 6, 95. 

 HINSDALE, S. J. Tannin, colorimetric method for. Chem. News, 62, 19. 

 HLASIWETZ and MALIN. Tannin, note on error in estimating. Dingl. polyt. Jour., 



229, 87; Wien. Akad. Ber., 1867, 55, 19. 

 HOOPER, DAVID. Tannin in Indian and Ceylon teas, on the. Chem. News, 60 



(1870), 311. 



JAHODA, RUDOFF. The variability of the percentage of tannin in some tanning ma- 

 terials. Zeitsch. f. angew. Chem. (1891), 4, 104. 

 KOKOSINSKI, E. Tannin, determination of in hops. Ztschr. f. d. ges. Brauw. (1890), 



13, 571; Chem. Ztg. Rep., 15, 3, 27. 

 MUNTZ and RAMSPACHER. Tannin, estimation of. Zeitsch. f. anal. Chem., 13, 462; 



Compt. Rend., 79, 380. 

 RENISCH, H. Tannin of the sumach. N. Jhrb. d. Pharm., 25, 82 ; Zeitsch. Chem., 1866, 



220; Jsb. d. Chem., 1866, 695. 

 SCHIFF, H. Tannic acid, constitution of. Ber. d. chem. Ges., 1871, 231, 967; Bull. 



soc.chim. [2], 16,198. 



