72 



Elaic Acid^OLEic Acid. 



Elaill = Olein. 



Elaterit. See Ecbolin. 



Elateriu = C40 H28 Oio. In the fruit of Ecballion Elaterium. 

 Press tlie fruits, evaporate the juice to honey-consistence, treat 

 with alcohol, precipitate the solution with alcoholic acetate of lead, 

 remove tlie lead from the filtrate by sulphuret of hydrogen, evapo- 

 rate and edulcorate the remnant with ether, dissolve the residue 

 in alcohol, and throw down the E. from the liquid with water. — 

 Colourless, lustrous, tabular or needle-like crystals; tastes very 

 bitter; fuses at 200°, decomposes in higher temperatures; has a 

 neutral reaction; is insoluble in water, dissolves in 15 parts cold 

 and in 2 parts hot alcohol, in 290 parts ether, little in oils, in 

 concentrated sulphuric acid and precipitable from it by water 

 without change, not in diluted acids and alkalies. 



Elecaiiipaiie-Stereopteii^HELENiN. 



El6IIli. Exudation of the stem of Bursera Icicariba. Tough 

 light-yellow or greenish-yellow mass, has a fennel-like smell and 

 aromatic bitter taste, sinks in water, dissolves with difficulty but 

 completely in alcohol. Contains 60% readily soluble resin of acid 

 reaction zrC^o H32 O4 ; 24% slowly soluble, crystalline resin, 

 Elemin=:C4o H33 0; and 12^% volatile oil. 



Ellaffic Acid = C2sH6 0iG-f6 HO. In the Turkish nutgalls 

 (from Quercus infectoria), and, it appears, in the root of Poten- 

 tilla Tormentilla. By fermenting the pulverised nutgalls with a 

 little water and at a moderate heat, the tannic acid changes into 

 gallic acid, the products of decomposition of sugar and Ellagic 

 acid. Press out, boil the press-cake with water, and press and 

 filter the liquid, milky, from separated E. while still hot; a yel- 

 low-white powder impure E. remains on the filter, it is dissolved in 

 duuted potash-ley, and the filtered liquid evaporated at the air, 

 whereby gi-een- white scales of Ellagate of potash subside, which 

 have to be rinsed with water and decomposed with diluted hydro- 

 chloric acid, which throws down the E.— Pale-yellow, light powder, 

 consisting of microscopic needles, without taste, of slightly acid 

 reaction, loses at 120° four equivalents and up to 200° two 

 more equivalents of water, sublimates afterwards, without fusing, 

 partly undecomposed in sulphur-yellow needles, dissolves even in 

 boiling water very little, little in alcohol, not in ether, readily in 

 fixed alkalies, little in liquor of ammonia, in concentrated sulphuric 

 acid unaltered in the heat and re-precipitable by water. Its salts 

 easily decom])Ose in the moist state, and only those of the alkalies 

 dissolve in water. 



