Exhaust powdered aconite, 200 parts, with alcohol containing 2 parts of tartaric acid. Retain the first 170 parts of the percolate, evaporate the remainder to 30, at a temperature not exceeding 50° C. (122° F.), and mix with the reserve portion. Place the mixture in an evaporating dish, and having added 50 parts of sugar of milk, cover it with a piece of thin muslin gauze and set aside in a warm place, where the temperature will not rise above 50° C. (122° F.), until the mixture is dry. Lastly, having added enough sugar of milk to make the mixture weigh 100 parts, reduce it to a fine uniform powder.