144 
DR. JOHN STENHOUSE ON VEGETABLE PRODUCTS FROM INDIA. 
liquors are first treated with basic acetate of lead, the precipitate is collected on a 
filter and washed, and then, having been distributed through water, is decomposed 
by sulphuretted hydrogen. The solution which has filtered from the precipitated 
sulphide of lead, is then concentrated, and boiled with dilute sulphuric acid. The 
datiscetine produced in this way can be easily separated from the resinous matter, 
as the latter is precipitated before the formation of the datiscetine by the acid, and 
adheres to the bottom of the flask. By dissolving the datiscetine thus obtained in 
alcohol, and precipitating it by the addition of water, it is rendered tolerably pure. 
Properties of Datiscetine. — Datiscetine has no taste. When heated it melts like 
datiscine, but the heat required is much higher than is necessary for that body. It 
crystallizes again on cooling. By operating very cautiously, a portion of the datis- 
cetine may be sublimed in crystals. This sublimate, however, appears to be altered 
datiscetine, for, when recrystallized out of ether, it has a sweet taste. Datiscetine on 
burning does not emit the smell of caramel. 
Datiscetine, like datiscine, dissolves in alkaline solutions, and is reprecipitated by 
the addition of an acid. When an alcoholic solution of acetate of lead is added to 
one of datiscetine, also dissolved in alcohol, a finely coloured deep yellow precipitate 
is obtained, which can be easily washed both by alcohol and water. 
This precipitate therefore was subjected to analysis. 
Analysis of Datiscine and Datiscetine. — The lead salt of datiscetine, when subjected 
to analysis, gave the following results : — 
I. 0‘4555 grm. gave 0 2060 grm. PbO. 
0 2655 grm. gave 0'3515 grm. CO 2 and 0'0405 grm. HO. 
II. 0‘4310grm. gave 0T945 grm, PbO. 
III. (from another preparation). 
0'4170 grm. gave O' 1907 grm. PbO. 
0’3170 grm. gave 0*4195 grm. COg and 0 0460 grm. HO. 
These analyses give the formula C 30 Hg Oio-l- 2 PbO. 
Required. 
Found. 
1. 
II. 
III. 
C,o = 180-0 
36-63 
36-11 
36-09 
Hg = 8-0 
1-63 
1-69 
1-61 
Ojg = 80-0 
16-28 
— 
2PbO = 223-4 
45-46 
45-22 
45-13 
45-73 
Analysis of Datiscetine. — The different preparations were all dried at 100'^ C. in a 
current of dry air, and burned in the gas furnace. 
Datiscetine crystallized out of Alcohol. 
I. 0*3970 grm. gave 0*9155 grm. CO 2 and 0*1280 grm. HO. 
II. 0*4455 grm. gave 1*0275 grm. CO 2 and 0*1485 grm. HO. 
