Process of Displacement. 
311 
The displacement most advantageous: with 500 grammes 
of water I obtained 61 of extract; by maceration 520 
grammes gave only 38 grammes of extract; 1200 of water 
by displacement gave 98 of extract, whereas 1560 by mace- 
ration afforded only 59. The water at first filtered through 
the liquorice powder very rapidly; when this became some- 
what swelled, the operation went on very advantageously. 
It only required four hours to exhaust the powder in the most 
complete manner, whilst it took two days to exhaust it by 
maceration. 
Senna. — After having pulverized the senna, aud subjected 
it to the action of a seive, it was treated by displacement. 
At first the powder permitted the fluid to run through very 
rapidly, and the first result was very little charged with so- 
luble principles; the senna, however, soon swelled greatly 
and developed a viscous matter; so that after affording 200 
grammes of a highly charged fluid, the operation completely 
ceased. 
I took another portion of senna, and contented myself with 
coarsely powdering it. On pouring water over it, it ran 
through with great rapidity during the whole operation; the 
viscous matter had not time to become developed, and the 
substance was exhausted in less than two hours, but it re- 
quired a great quantity of water. 
Maceration. Displacement. 
Powder, 170 grammes. 
r. 
100 
gave 3 extract. 
Water, 340 
2 
100 
3 
The powder retained 2-3 of the 
3 
400 
13 
water. 
4 
400 
11 
1. 112 gave 8 extract. 
5 
200 
3 
2 188 13 
3 225 7 
1200 
33 
525 28 
The displacement is in this case superior only in the quan- 
tity of the product. 
Gentian. — The process by displacement was not advan- 
tageous with this root. The fluid passed through, but so 
