Note 16 — Chapter XXVI · CYSTS AND TUMORS. (continued 2)

The preparations of arsenic which have proved most satisfactory are the imported cacodylate of sodium, which comes in capsules ready sterilized for use, and the following solution, which is original and needs to be made up in accordance with the formula herewith furnished:

(1) Dissolve 7 grains mercuric biniodide with 10 grains potassium iodide in a little water. (2) Dissolve 48 grains arsenic bromide in a little water with the aid of gentle heat. (3) Dissolve 24 grains gold chloride in a small amount of water. (4) Mix the mercuric and the arsenic solutions and then add the gold solution, which will cause a whitish precipitate, becoming brownish in color. (5) Heat this mixture and decant the clear portions, setting it aside. (6) Add 2 drachms nitromuriatic acid to the above precipitate and heat gently until a clear red solution results. (7) Add to this the decanted portion of 5, which will cause a reddish precipitate. Heat the whole mixture up to the boiling point and until all residue is dissolved. (8) Add sufficient distilled water to make 15 fluidounces. The product should be bright, clear, and wine colored.

Of this solution 10 drops are supposed to represent ¹⁄₁₀₀ grain mercuric chloride, ¹⁄₃₀ grain gold chloride, ¹⁄₁₅ grain arsenic bromide. The commencing dose is 10 minims, which may be increased to 25 or more, taken in abundance of water.