The dried seed of Physostigma venenosum. Western Africa.

Fig. 188.   Calabar Bean, half the natural size.

Fig. 188. - Calabar Bean, half the natural size.

Characters. - A kidney-shaped bean about an inch long, chocolate-coloured, shining, and with a broad black groove along the whole length of the convex edge. Internally the bean is white, and tastes like an edible bean.

Composition. - Contains two alkaloids - physostigmine or eserine, and calabarine.

Dose. - Of the powdered bean 1 gr. gradually increased.

Peeparations.

B.P.

Dose.

Extractum Physostigmatis...................

1/15-1/4 gr.

U.S.P.

Extractum Physostigmatis...................

1/15-1/4 gr. (0.001-0.01 gm.)

Tinctura Physostigmatis

12 min.