106 



and alkalies, soluble iii alcohol, fuses at 185°, combines with acids, 

 but does not neutralise them. 



Heilipseert 011 = Oil of Cannabis sativa. 



Hesjieridill. Bitter ingredient of the unripe bitter oranges, and 

 of the white spongy parts of the fruit-peelings of bitter oranges 

 and lemons. Exhaust with water, concentrate, treat the extract 

 with strong alcohol, evaporate, add water and allow to crystallise 

 slowly. — Delicate, silky, bitter, needle-like crystals, united to 

 warty concrescences; dissolves very little in cold, in six parts 

 boiling water ; slightly in cold, most readily in hot alcohol ; not in 

 ether and oils. According to recent investigations it appears 

 to be a glucosid, said to contain instead of sugar dulcit 

 n:Ci2 Hi4 Oi2, a non-fermentable kind of sugar. 



HuailOkill=:C.2o H12 NO (isomeric with Cinchonin). Alkaloid 

 occurring in the Quina huanoko plana (from Cinchona micrantha), 

 distinguishable by the following characteristics. It crystallises in 

 small colourless prisms; is tasteless, of slightly alkaline reaction, 

 which becomes more decided in an alcoholic solution, but then 

 possessing a slightly bitter taste; fuses readily, and sublimates by 

 a stronger heat; is insoluble in water; dissolves in. 400 parts 

 cold, and in 110 parts boiling alcohol of 80%, in 600 parts cold, 

 and in 470 parts boiling ether. 



Hurill. Acrid, crystalline substance of the milky juice of 

 Hura crepitans. It is obtained after the milky juice has been 

 evaporated and boiled with alcohol, the alcoholic solution evapo- 

 rated and exhausted with water, the residue extracted with ether, 

 and the etherous solution evaporated; as an oily, afterwards 

 crystalline substance of acrid and burning taste, of alkaline 

 reaction, fusing above 100°, boiling aftei'wards and evaporating 

 in exti-emely pungent vapours; readily soluble in alcohol, ether, 

 and oils, not in water; not changed by alkalies. 



Hydra still =:C44 H23 NO12. Alkaloid, associated with ber- 

 berin, in the root of Hydrastis Canadensis. The mother-ley 

 remaining from the preparation of berberin is freed from alcohol, 

 is diluted with water and cautiously mixed with ammonia until 

 the precipitate, consisting of resins, remains permanent. The 

 filtered liquid, when mixed with a little excess of ammonia, forms 

 a drab-coloured precipitate, which has to be washed and re- 

 crystiillised in alcohol with aid of charcoal. — White, very glossy, 

 quadrangular prisms, tui-ning opaque on drying, undissolved 

 tasteless, when dissolved of a bitter and acrid taste; narcotic; of 

 alkaline reaction; fuses at 135°, decomposes afterwards; scarcely 

 dissolves in water, readily in alcohol, ether, chloroform and 

 benzol, not in alkalies. Its salts are not crystallisable, but readily 

 soluble and very bitter. 



