34 
with it. The difference between Kath and Catechu is partly due to the 
methods of иссе partly to the difference in the trees. 
The trees in Burma differ from those of the North-west Provinces, 
and at each place hes are two kinds of trees, No. 1 and No. 2, although 
of — the same sees соед No. s have white spots in the wood, 
caused by a white substance stored up in cylindrical masses half a 
millimetre thick and 10 туна ir Trees No. 1 have no white 
spots. Trees with spots yield an extract richer in catechin, and both 
kinds of trees > = — Provinces yield more catechin than the 
corresponding k n Bur 
I found the following кыйн of catechin in the total extract ;— 
Catechin, 
Burma, No. - - - - - 14 per cent, 
№. 2 (spotted) - - - 30 y 
North-west Provinces, No. 1 5-88 — 
й » No. 2 (spotted) - 40 4 
- The greatest amount of extract obtained from each kind of wood was 
as follows ;— 
Extract. 
Burma, No. 1 E - * - 17 per cent. 
No. otted)  - - se 8. wi ss 
North-west Provinces, No. 1 - 14. № 
” ” No. 2 (spotted) а: Mex» 
h 'eatest amount of catechin obtainable from these woods is 
accordingly as follows :— 
Catechin. 
Burma, No. - - - 2 per cent. 
No. ә (spo tted) M " s o le 
North-west Peres но тыт 
” o. 2 (spotted) v ” 
Such a great ncm of catechin in the spotted =e of the North- 
west Provinces explains that Kath manufacture t home there, 
Moreover, the local Kath makers are ырны to a ga as unfit all trees 
which do = contain white spots, so that the trees No. 1 become wasted 
in the fores 
I Сны the catechin by direct separation as follows. About tw 
ounces of the wood reduced to thin shavings were boiled with 20 Qe 
their weight of water for half an hour. The extract was separated from 
the wood by repeated settlement, and reduced in bulk on the water bath 
until it just began to thicken, and contained by estimate 6 per cent. of 
catechin. It was then left to stand in a cool place for five days for the 
crea of the catechin. Опсе the eatechin had separated, the liquid 
be diluted with cold water for the purpose of filtering, The 
filtered ud pies washed catechin was dried at ordinary temperature, 
and weighed in a thoroughly air-dry condition. 
The high degree of еи and the long standing are required 
se the catechin separates with difficulty out of an extract which 
contains so much Catechu анд Once the bulk of the tannin is sepa- 
rated, the eatechin may be dissolved in much more water, and it ар 
separate оне, on cooling, but the catechin is at all times 
delicate substance, which changes with water slowly into a soluble к 
stance, and is thus lost. drying of the moist hin must 
