211 



the Siirinamin is obtained. The rest is got by digesting the liquid 

 with magnesia, filtering and evaporating again. Wash the Surinamin 

 with cold water and recrystallise in hot water. — Forms white, 

 very fine, voluminous, cotton-like needles of insipid taste ; neutral ; 

 is partly cai'bonised and partly suljlimates on heating; dissolves 

 very little in cold, readily in boiling water, almost insoluble in 

 cold, little soluble in boiling alcohol, readily in diluted acids, also 

 in potash-ley. 



SycOCeryl-Alcollol^Cse H30O2. As acetate of Sycoceryl in 

 the resin of Ficus rubiginosa. Withdi-aw the sycoretin from the 

 resin by means of cold alcohol, and boil the remnant with alcohol, 

 the solution forming on cooling crystals of acetate of sycoceryl 

 and afterwards a small quantity of another flocky substance. By 

 cooling the solution to 40°, straining the crystals, recrystallising in 

 boiling alcohol and treating at 30° with ether so as to leave a 

 little of the substance undissolved, the acetate of Sycoceryl is ob- 

 tained pure, while a neutral crystalline substance, insoluble in 

 ether, remains. Decompose the acetate through boiling with a 

 solution of caustic soda in alcohol, precipitate the Sycoceryl-alcohol 

 which has formed with water and recrystallise in alcohol. — Forms 

 wawellite-like, very thin crystals, sinülar to cafiein; fuses at 90°, 

 and is volatilised partly \mdecomposed by more heat; is insoluble 

 in water and in alkalies, readily soluble in alcohol, ether, benzol, 

 and chloroform. 



SyC0Ceryl-Acetate=:03G Hoo O + C4 H3 O3. Ingredient of 

 the resin of Ficus rubiginosa, and doubtless of other species, 

 obtained from it according to the foregoing paragraph. — Appeals 

 in thin, mica-like leaflets or sexangular tabular crystals; neutral; 

 fuses at 118° to 120°, distils unaltered, dissolves most readily 

 in hot alcohol, in acetic acid, aceton, ether, benzol, oil of tur- 

 pentine. 



Sycoretin, In the resin of Ficus rubiginosa. This resin 

 sepai'ates on treating with cold alcohol into about 73% soluble 

 Sycoretin, 14 sycoceryl-acetate, soluble in hot alcohol, and 13 

 residue (caoutchouc, sand and fragments of bark). By mixing 

 with water the neutral, light-l)rown solution in cold alcohol, the 

 Sycoretin subsides and may be obtained colourless by repeatedly 

 dissolving and precipitating. — Amorphous, white, neutral, very 

 brittle, very electric; fuses in boiling water and floats on it like an 

 oil, fuses by itself only at 300°, and decomposes afterwards; is 

 insoluble in water, diluted acids and alkalies, readily soluble in 

 alcohol, ether, chloroform, oil of turpentine; in concentrated 

 sulphuric acid \vdth a beautiful green colour without formation of 

 sugar. 



Sylvic Acid. See Abietic Acid. 



p2 



