102 



HiiematOXylill=C32 Hu O12 + 6 HO. In the wood of Hsema- 

 toxylon Campechianum. Mix the commercial extract with much, 

 sand, macerate the whole with several changes of ether, evaporate 

 the brown-yellow solutions to a syrup-like consistence, mix with 

 water and allow to crystallise. Wash the crystals with cold 

 water, press and recrystallise in water containing a little sulphurous 

 acid. — Colourless, snow-white, or pale straw-yellow quadi-atic 

 prisms, lose by keeping 4 equivalents, at 100° the last 2 equivalents 

 of water without melting when slowly heated. It has a strong 

 liquorice-like very lasting taste, not bitter or acerb ; is destroyed 

 in high temperatures ; dissolves little and slowly in cold, abund- 

 antly in boiling water, more readily in alcohol than in ether, in 

 liquor of ammonia with at first pink, then beautiful purple-red 

 colour under formation of h8ematein:= C32 H12 O12 ; fixed alkalies and 

 their carbonates have a similar eflect, likewise lime-water and solu- 

 tion of baryta ; is precipitated pure white by acetate and by subacetate 

 of lead, the precipitate assuming quickly a blue colour at the aii\ 



Hitlft'euic Acid. Supposed peculiar acid of the flowers of 

 Hagenia Abyssinica, occurring in combination with ammonia. 

 Explicit statements are wanting. 



Hariualin=C26 H^ ]Sr2 O 2. Alkaloid of the seeds of Peganum 

 Harmala. After the solution of the chloiides of harmin and 

 Harmalin, as stated under Harmin, has been mixed with a little 

 ammonia, harmin subsides, while Harmalin remains dissolved. 

 Precipitate this solution with excess of ammonia, triturate and 

 mix the deposit with water, add acetic acid until it is almost com- 

 pletely dissolved, throw down the filtrate with nitrate of soda, 

 with chloride of sodium or with hydrochloric acid, wash the sub- 

 siding salt with a diluted solution of the precipitating agent, and 

 ]")urify by treating its aqueous solution with animal charcoal. 

 Precipitate the solution with potash-ley ; wash the deposit Avith 

 water, afterwards with absolute alcohol, dissolve in boiling 

 absolute alcohol, and leave to cool under exclusion of the air. — 

 Forms colourless, klinorhombic crystals ; is almost tasteless by 

 itself ; when dissolved of a pure bitter taste ; loses at 190° nothing 

 of its weight, fuses afterwards and decomposes. Newly precipi- 

 tated or moist Harmalin assumes at the air, more especially if under 

 the influence of vapours of ammonia, a brown colour, dissolves very 

 little in water, little in cold, readily in boiling alcohol, little in 

 ether, slighly in volatile oils, is converted into harmin by heating 

 its nitrate with alcoholic hydrochloric acid. Neutralises the acids 

 and forms readily soluble, crystallisable salts. These and their 

 solutions are yellow, taste bitter, and ai-e precipitated by caustic 

 alkalies ; they dissolve more readily in pure water than in water 

 containing acids or salts, and are precipitated iia aqueous solutions- 

 by acids and by salts. 



