it also dissolves in diluted acids, but witliout yielding crystal- 

 lisable salts. It dissolves colourless in concentrated sulphuric 

 acid ; and chi'omate of potash originates in the solution pale purple- 

 red zones, similar to those which are produced by subjecting strych- 

 nin to the same process, but much paler. Its solution in 

 concentrated nitric acid is gold-yellow. Caustic potash, ammonia 

 and carbonate of potash give a white precipitate; carbonate of 

 ammonia, bicarbonate and phosphate of soda none; chloride of 

 mercury, sulphocyanide of potassium and tannic acid a white one, 

 picric acid a yellow one, tincture of iodine a red-brown, chloride 

 of gold a yellow-white, and chloride of platinum none. 



Acorn Siig'ar = Quercit, 



AdailSOnin = C48 H36 O33. The bitter ingredient of the 

 bark of Adansonia digitata and A. Gregorii. In order to obtain 

 it in a pure state, evaporate the alcoholic extract to dryness, boil 

 with water, mix with finely ground oxyd of lead, filter, evaporate 

 nearly to dryness, shake with ether and leave the ethereous liquids 

 to evaporate without heat. Fine, white needles of a smell similar 

 to that of aloes or gentian, of extremely bitter taste, fusible by 

 heat, but becoming afterwards carbonised; dissolves in six parts 

 cold and three parts boiling ether, also readily soluble in absolute 

 and in common alcohol and perceptibly in water. The solutions 

 do not iDecome turbid by alkalies and by metallic salts. Chloride 

 of iron imparts to the alcoholic solution a greenish tinge. 



J^lsculill = C42 H24 O2C + 3 HO. In the bark of ^sculus 

 Hippocastanum ; its occurrence in other plants (in the quassia, 

 sandalwood, &c.) has to be further proved yet. Exhaust with 

 alcohol of 80°, distil off the bulk of the alcohol and leave the 

 rest to stand in the cold for a few weeks. The JE., which will then 

 have separated, has to be washed with ice-cold water and recrystal- 

 lised repeatedly in ether-alcohol. Snow-white, fine crystalline 

 needles, often globularly arranged and of the appearance of a 

 loose powder, inodorous, of slightly bitter taste and of acid re- 

 action. It fuses at 160° under loss of the watei", and is decomposed 

 in higher temparatures ; dissolves in 672 parts cold, already in 

 12i- parts boiling water. The cold saturated solution is colourless 

 and of a fiiint blue fluorescence, which becomes more marked after 

 the addition of well-water; it loses this property by acids, but re- 

 covers it throixgh alkalies and alkaline earths. It dissolves in 

 diluted acids or alkalies more readily than in water; the alkaline 

 solution appears blue in the reflected and yellow in the trans- 

 mitted light. Dissolves in 120 parts absolute alcohol, in 100 

 parts alcohol of 82%, in 80 parts rectified alcohol, and in 24 

 parts boiling absolute alcohol. It changes into sugar and sescule- 

 tin (Ci8 Ho Os ) when boiled with diluted acid?. 



