BIBLIOGRAPHY OF LITERATURE. 1003 
ployed. In the original article several of the constants for different tannins 
are given. Chem. News, 55, 168. 
WaGNeER. 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, ete. 
Zeitsch. f. anal. Chem., 28, 114. 
WILDENSTEIN, R. A colorimetric 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. 
Wotrr, 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. 
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CaRLES, P. Tannin, gelatin solution for estimating. Chem. News, 51, 297; Zeitsch f, 
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Erti, C. Tannie acid, composition of. Chem. Centrbl., 1880, 204; Jsb. d. Chem., 
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