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llIail«*OStail-Resill=C36 H22 Oio. Exudation of the stem of 

 Garcinia Mangostana. Of a beautiful lemon-yellow colour; 

 "brittle; inodorous and tasteless; fuses at 110°; dissolves readily 

 ill alcohol and in ether. Is decomposed by liquor of ammonia 

 into two resins, the one of which fuses at 80°, and the otliei- 

 at 115°. 



Mail}»"OStill=::C40 H22 Oio. In the fruit-peels of Garcinia 

 Mangostana. Boil the peels, after exhausting with hot watei*, 

 with alcohol, evaporate the tincture until amorphous, yellow 

 masses of resiii and Mangostin are formed, dissolve the latter 

 in alcohol and add to the solution, heated to the boiling-point, 

 water in small quantities, until it becomes turbid. On cooling, 

 the resin subsides and the liquid, after being poured off and 

 kept for some time, throws down the Mangostin, which has to 

 be purihed by dissolving in alcohol and precipitating with sub- 

 acetate of lead. The precipitate after washing is mixed with 

 alcohol and decomposed by sulphuret of hydrogen, the filtered 

 alcoholic liquid is mixed with water and allowed to rest until 

 crystals are formed, which have to be recrystallised in diluted 

 alcohol. — Thm laminaj of a beautiful gold colour, inodorous and 

 tasteless, fusible at 190°, partly sublimating at a higher heat, 

 neutral, insoluble in water, readily soluble in alcohol, ether, and 

 alkalies. 



Mailllit=:Ci-2 Hi4 O12. In considerable quantity in the manna, 

 a sweet exudation obtained by incisions into the stem of Fraxinus 

 Ornus and Fr. rotundifolia, and also occurring in many other 

 jdants, being contained in their roots, stalks, leaves, barks, seeds, 

 and also nearly in all fungi. To prepare it from the manna, allow 

 the aqueous solution to ferment with yeast, in order to destroy the 

 sugar, decolourise with animal charcoal, evaporate so as to 

 form crystals, and recrystallise. Or, boil with alcohol, filter hot, 

 let crystallise and recrystallise. — Forms long rhombic, concen- 

 trically or tuftily united needles of a slight and pleasant sweet taste, 

 without rotating power; loses at 120° nothing of its weight; fuses 

 at 166°, volatilises when kept in a fused state in small quantity 

 and sublimates unaltered; begins to boil at 200°, while a portion 

 volatises and another portion loses 2 eq. water being converted into 

 mannitan, but the largest portion remains undecomposed ; above 

 250° it swells up and is destroyed. It dissolves in 6 parts cold and 

 in any quantity of hot water, almost insoluble in cold absolute 

 alcohol, in hot aqueous alcohol in large quantity (in 1430 to 1660 

 parts absolute alcohol at 14°, in 84 to 90 parts alcohol of 0.898 at 

 15°, not soluble in ether. Yields with nitric acid, oxalic, but 

 no mucic acid, dissolves in concentrated sxilphuric acid ^^dthout 

 colouration, is not altered on boiling with diluted sulphuric acid, 

 with aqueous alkalies and with alkaline tartarate of copper; is 



