Note 499 — PHARMACOLOGIA. (continued 4)
Reading edition
Mystery is rarely practised but as the cloak of imposture; it is therefore unnecessary to add, that Mr. Barry made no difficulty in stating the following to be the formula by which it was prepared.
A tincture of Bark, made with rectified spirit, was distilled until the whole of the spirit was driven off, the remaining solution was then left to cool, after which the resin that floated on the surface was removed, and the residuum inspissated at a low temperature.