127 



not able to fei^ment with yeast, is not precipitable by acetate and 

 subacetate of lead, but by the ammoniacal acetate of that metal. 



Marrul)ill. Bitter substance of Marrubiimi vulgai-e. Draw 

 out with hot water, digest the liquid with animal charcoal, whicli 

 takes up the bitter substance; treat the coal with alcohol, distil 

 off the alcohol from the tincture, warm the remaining liquid, until 

 every trace of alcohol is removed, withdraw the Marrubin from 

 the thick mass by means of ether, and allow the solution to 

 evaporate slowly.— It crystallises in colourless, rhombic, tabular 

 crystals, from the alcoholic solution in needles, tastes strongly 

 bitter, fuses at 60°, decomposes in higher temperatures, is almost 

 insoluble in cold water, slightly soluble in hot water, readily in 

 alcohol and in ether; has a neutral reaction; dissolves in concen- 

 trated sulphuric acid with brown-yellow colour, in hot con- 

 centrated nitric acid with yellowish colour; h3-drochloiic acid 

 and alkalies have no effect. 



Maruill Cainplior, passes over in the distillation of Tecurium 

 Marum with cold water. — White leaflets, heavier than water, 

 of a disagreeable aromatic smell and taste. 



MaS01)ill = C44 H36O2. A crystalline resin, main ingredient 

 of the dschilte (the hardened sap of a Mexican tree, Achras 

 Sapota). To prepare it, boil the dschilte with water, and treat the 

 remaining viscid, elastic body with absolute alcohol, which leaves 

 the adherent caoutchouc undissolved. Precipitate the Masopin 

 f I'om the alcoholic solution with water, and reciystallise in ether. — 

 White needles, of silky lustre, devoid of taste and smell; fuse at 

 155° without loss of weight, exhaling a pleasant odour, and 

 solidify afterwards to an amorphous, vitreous mass, the fusing 

 })oint of which is only 69° to 70°. 



MllSticll. Exudation of Pistacia Lentiscus. Yellowish white, 

 transparent grains, on the fracture of glass-like lustre, of faint 

 smell, of aromatic and somewhat bitter taste, softens on masti- 

 cating, fuses at 80°, readily soluble in absolute alcohol, ether and 

 oils, in alcohol of 80°/^ to the extent of four-fifths, and leaving 

 a soft resin (masticin). The readily soluble poition of the resin 

 has the formula C40 H31 O 4 , the slowly soluble CUo H31 O 2 . 



Mayiias-Resill = C28 Hig Os. From incisions in the stem of 

 Galophylhmi Caloba and C. longifolium, in the South American 

 province of Maynas. — Crystallises from boiling alcohol in beauti- 

 fully yellow rhombic prisms, fuses at 105°, is afterwards decom- 

 posed, is insohible in water, readily soluble in alcohol, ether, 

 acetic acid, fixed and volatile oils, also in alkalies; in concentrated 

 sulphuric acid with beautiful red colour. 



Mecca Balsam. Exudation of the stem of Balsam odendi'on 

 Opobalsamum. Of thin fluidity, pale jellow, of 0'95 density. 



