Part IV.]. Puran Singh: Preparation of Tannin Extracts . 19 
After the extract leaves the vacuum pans, it has to be further 
dried otherwise the percentage of moisture remains too high. 
In order to dry the extract there should be a shed having a large floor 
covered with canvas, or in place of canvas, boxes of uniform size about 
V' deep might be made to receive the wet extract, which should then be 
allowed to dry by keeping the boxes on a system of shelves specially 
constructed. 
About 18 tons of Mangrove tannin extract was experimentally 
prepared in February 1911 by admixing myrabolams with Mangrove 
barks in the proportion of 1 : 6 previous to extraction in order to counter¬ 
balance the disadvantage of the alkalinity of water used. 
The following table gives the percentage composition of an average 
sample taken out of the bulk according to different chemists :— 
j 
c 2 
236 
