aid 
place at a low temperature, as TA at once destroys the microscopic 
crystals, 
The manufacture of Kath, or raw catechin, is carried on in the forests 
with very primitive appliances, The filtering i is done through layers of 
sand, and much sand becomes mixed up with the Kath, The drying is 
performed i in the open air. 
he people say that they possess a manufacturing secret, but there 
seems no need for one, unless their secret consists in the mixing of some 
finished catechin with the thick liquid, which sometimes promotes the 
separation of the new catechin, Anyhow, I made out of the 50 lbs. of 
Acacia Catechu, No. 1, from the North-west Provinces, nearly 2 Ibs. of 
pure catechin, and it is from this wood that the Kath makers of the 
North-west Provinces declared themselves incapable of making Kath. 
For filtering larger quantities of catechin I found the filtering press an 
excellent expediei ent. The pressed catechin dried in a few days from 
simple рз to the air, and once dried the catechin is a very durable 
substa 
Оо with iron must be ser ad avoided during the extraction 
of catechin. With Catechu or Cutch contact with iron is of no con- 
sequence, and the reports mbon i caldrons in use for the final 
boiling down of the Cutch in Burm 
The preparation of Cutch or Gast is of course simpler than that of 
Kath, because nothing but watery extraction of the wood is required, and 
subsequent boiling down of the extract. 
After a certain de egree of concentration a skin forms over the surface 
of the hot liquid, and constant stirring for hours is required to effect the 
final dessication. ‘This long stirring process is also mentioned, but not 
explained, in the descriptions of the Burmese Catechu extraction, In 
H, WARTH. 
December 1890. 
‚ As pointed nes by Fluckiger and Hanbury (Pharmacographia, 
р. 387), Pale Cutch and Gambier agree in но, both consisting 
mainly of Catechin m энеге acid). This is readily soluble in hot 
water, but much less so in cold; it is therefore ° deposited i А * crystalline 
i is 
and l 
methods of preparation " obviously e induce EI when the 
critical th of concentra tion has been 
Warth, impedes the район of the Catch i ina cdam form. 
It is remarkable ge Pale Cutch does not appear to be met with in 
commerce. As it so closely agrees with Pra iie which is now in 
— 
great demand, it wast be probably readily accepted by tanners as a 
substitute, 
CLXXXVII.—PRODUCTION OF CANE-SUGAR IN THE 
SUGAR-CANE. 
The sugar-cane will no doubt have, even when bounties are with- 
drawn, still to compete on no unequal terms with the beet. It is obvious, 
n, that no pains should be spared to increase its productiveness in - 
