Strychnine, 1 1/4 grains.

Elixir of pyrophosphate of iron, 16 fluidounces.

Acetic acid, a sufficient quantity.

Powder the strychnine and gradually add acetic acid and triturate until a clear solution results. Mix this with the elixir of pyrophosphate of iron, and, if not of neutral reaction, add acetic acid or ammonia water to neutralization

Each fluidrachm (teaspoonful) of the finished elixir contains one- hundredth of a grain of strychnine in the form of acetate of strychnine, which is the proportion adopted by the American Pharmaceutical Association, 1875.

Our experience is decidedly in favor of acetic acid for making the salts of all alkaloids which are to be associated with pyrophosphate or citrate of iron. These preparations of iron are incompatible with most acids, and require to be neutral or alkaline if held in solution, while, upon the contrary, most alkaloids demand an excess of an acid. Acetic acid may be added until the solution of the iron salt is even slightly acid, as shown by its action on blue litmus paper, and such a solution will generally remain clear, although it may gelatinize. Every aqueous or slightly alcoholic liquid containing strychnine in solution should have, if possible, an acid reaction, else the alkaloid may gradually separate, and danger of poisoning follow the administration of this sediment. Hence our directions to add enough acetic acid to overcome all alkaline reaction.