Harmaline.—In the pure state it is quite colourless, but it is usually obtained of a somewhat brownish colour. To obtain it per fectly pure, it is diffused in water, acetic acid added until the greater portion is dissolved ; the filtered solution diluted, and precipitated with nitrate of soda, chloride of sodium or muriatic acid, up«n which it is again filtered, and the salt, after being washed with a solution of the precipitant employed, dissolved off the filter with lukewarm water. The solution is digested with animal charcoal till it possesses a light yellow colour; it is then precipitated, whilst still hot, by an excess of caustic potash. If the precipitate is not perfectly white, the same operation must be partially or wholly repeated ; and even then the preparation usually acquires a brownish tint on filtration and washing, especially when ammonia has been employed instead of potash to precipitate it. This colouring is undoubtedly owing to the influence of the oxygen of the atmosphere. The harmaline thus obtained forms broad laminar and scaly crystals of pearly lustre, which are of larger size the more slowly the precipitating agent was added.....
Hydrochlorate of Harmaline.—This salt is most readily obtained by precipitating the acetate or sulphate of harmaline with chloride of sodium, in a solution of which it is sparingly soluble ; but it is still more advantageous to use hydrochloric acid to precipitate the acetate of harmaline, in which the hydrochlorate of harmaline is nearly insoluble. If the salt, after washing it with hydrochloric acid, does not possess a light yellow colour, it may be purified by dis solving it in cold water, and again precipitating it with dilute hydro chloric acid. The hydrochlorate of harmaline forms long, slender, prismatic crystals of a yellow colour, which contain 4 equivs. water, part of which however it readily loses. It dissolves pretty easily in alcohol and water. On analysis, it yielded......