Canadian pharmaceutical journal Volume 13 - Softcover

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1880 edition. Excerpt: ...several batches. Then, when the preparatory mixture has been effected, the remaining lard or mixture is fused and gradually added to and mixed with the first product. Ointment of oxide zinc is made by triturating two troy ounces of oxide of zinc to a uniform powder, then adding one troy ounce of lard, rubbing the mixture thoroughly, and finally adding by degrees eleven troy ounces of lard (or hardened mixture) previously fused, and then thoroughly incorporating the whole, stirring afterward occasionally, if required, until the ointment stiffens. Tincture of benzoin may also be added if desired. Ointment of veratria, when made according to the officinal direction, by first dissolving the veratria in alcohol, is difficult to prepare, because veratria, instead of dissolving promptly, agglutinates into masses that firmly adhere to mortar and pestle and become more and more troublesome to manipulate as the alcohol evaporates. By the above proposed general process for ointments of powdered substances the annoying features of the officinal process are obviated and an elegant uniform mixture is most easily attained. Cerate of cantharides has been the fertile cause ot much comment as to what process of preparing it is the most advantageous in securing invariably an efficient product. On several occasions within recent years the writer pointed out the result, as a final conclusion, that a comparatively high heat is the prime requisite for the preparation of an invariably active cerate. A water bath heat, as the Pharmacopeia directs, is wholly inefficient, so much so that an otherwise most active cantharides will frequently not yield a reliable product. The writer has formed the conclusion, atter many trials, that a cerate, in order to answer the...