The bark of any species of cinchona containing at least 3 per cent. of its peculiar alkaloids.

Preparation.

U.S.P.

Dose.

Infusum Cinchona (cinchona in powder 6, aromatic sulphuric acid 1, water q.s. to make 100 parts by percolation)...............................

1-2 fl. oz.

Fig. 200.   Bark of Cinchona officinalis, half the natural size.

Fig. 200. - Bark of Cinchona officinalis, half the natural size.