SOURCES. 
57 
Tannic acid. 26.00 per cent. 
Gallic acid. 6.20 “ 
Gum and insoluble tannin . . . 2.40 “ 
Calcium and other salts. 2.40 “ 
Woody fibre. 63.00 “ 
100.00 “ 
These figures indicate either that the quality of the 
galls was poor, or, more probably, that the methods in 
use at that time were defective. 
A more recent analysis was made in 1845 by Guibourt, 
with the following result: 
Tannic acid. 65.00 per cent. 
Gallic acid. 2.00 “ 
Ellagic and luteo-gallic acids ... 2.00 “ 
Chlorophyll. 0.70 
Brown alcoholic extract. 2.50 “ 
Gum. 2.50 “ 
Starch. 2.00 “ 
Cellulose. 10.50 “ 
Sugar, albumen. 
Sulphate of potassium .... 
Chloride of potassium .... 
Gallate of potassium.i- 1.30 “ 
Gallate of calcium. 
Oxalate of calcium. 
Phosphate of calcium . . . . , 
Water. 11.50 “ 
100.00 “ 
These results have been generally accepted, and are 
universally quoted in text-books, as no chemist since 
then has attempted such a detailed analysis. It may 
with reason be doubted if an analysis at the present 
time would agree in all points with this one. 
A still more recent, although not intended to be so 
