Extract of Calabar Bean

Syn. Extractum physostigmatis . (B. P.) Calabar bean in coarse powder, 1; rectified spirit, 5; macerate the bean for 48 hours in one fourth of the spirit in a closed ve el, agitating occasionally, then transfer to a percolator, and when the fluid ceases to pa add the remainder of the spirit, so that it may slowly penetrate through the powder; subject the residue of the bean to pre ure, adding the pre ed liquid to the product of the percolation; distil off the spirit, and evaporate what is left to the consistence of a soft extract by a water bath.— Dose , 1 ⁄ 16 to 1 ⁄ 4 gr.