a. ANACARDIACEZ. 
decoction precipitated with acetate of lead. The precipitate - 
washed and suspended in water was decomposed with sul- 
phuretted hydrogen. The solution filtered from the sulphide 
of lead was evaporated on a water bath to a small bulk and | 
finally dried over sulphuric acid. The tannin thus obtained 
was of a yellow colour and amorphous, but on boiling in water — 
and examining under the microscope, the yellow powder which 
separated on cooling was found to be composed of acicular 
crystals. The aqueous solution gave a white or yellow 
precipitate with gelatine, yellow with nitrate of lead, and blue- — 
black with férric acetate; with ammonia and chloride of 
barium, a yellow precipitate changing to green and brown, and 4 
a similar precipitate with lime water. It yielded a white or 
yellow precipitate with tartar emetic. With molybdate of 
ammonium a deep red solution was formed. No precipitate was 
obtained with bromine water. : 
The tannin digested in alcohol, and the filtered solution 
allowed to evaporate by exposure to the air, and finally dried 
over ‘sulphuric acid, was titrated by Léwenthal’s permanganate 
process, using the solution and observing the details recom- 
mended by H. R. Procter.* It was found that 1000 c.c. 
of a gig normal solution of permanganate of potash was equiva- 
lent to 5°560 grammes of the tannin. ‘Two grams of the 
finely powdered galls were exhausted by boiling with one — 
litre of water for about half an hour and the solution made 
up to a litre. Twenty cnbic centimetres required, as a mean 
of three titrations, 22 c.c. of permanganate (1 gram in 1000 
¢.c.). After precipitation of the tannin by the gelatine solution, 
50 ¢.c. = 20 c.c. of the original solution, required 5 c.c. of 
permanganate ; therefore 17 ¢.c. are equivalent to the tannin 
in 04 grams of the galls. By using the above equivalent, 
(1000 c.c. 35 normal permanganate = 5°56 grams tannin), 
the galls would contain 75 per cent. of tannin. 
ybout four hours, deposited an abundant reddish-brown 
: powder, the solution acquiring a. claret colour, The 
oe em Pharm, Journ: [3]. vii. 1020, and [3]. xvi. S43. 
powder = 
The tannin boiled with dilute sulphuric acid, 1 in 12, for 
ie 
