316 Dr. A. vou Planta and Mr. W. Wallace on Apiine. 



1. Li cold water. — A quantity of apiiue was dissolved in boil- 

 ing distilled water, and the solution allowed to cool to about 60° F. 

 and filtered. 98 grms. of the filtrate were evaporated in a pla- 

 tina basin, and the residue dried in the water-bath ; there re- 

 mained 0'012 grm. after deducting the ash. Therefore 100 parts 

 of water at 60° dissolve 0'0122 pai-ts of apiine, which is eqmvalent 

 to 8500 times its weight of water at that temperature. 



2. In boiling ivater it dissolves very readily. The exact quan- 

 tity, however, which is dissolved at 212°, or at the boiling-point 

 of the satm-ated solution, was not determined. The readiness 

 ^^ith which the solution gelatinizes renders it difficult or imprac- 

 ticable to determine this point with accuracy. The hot solution 

 is not adhesive. 



On cooling, it becomes a very stiff jelly, without tenacity, as 

 before explained. The jelly of impm'e apiine has a somewhat 

 greasy appearance, which is owing to the pi'esence of a cuiious 

 fatty substance which we had not time to examine. The jelly 

 has also a dark green colom-, from the presence of a small quan- 

 tity of chlorophyle. Pure apiine when gelatinized is nearly 

 colom-less, and is quite free from the fatty substance above re- 

 ferred to. "\nien the hot solution is highly diluted, a precipitate 

 forms of a light, alumina-lilce appearance, and this precipitation 

 occm-s whenever one part of apiine is dissolved in less than 8500 

 parts of hot water and the solution allowed to cool. The quan- 

 tity necessary to form a perfect jelly with water could not be 

 determined, as this depends very much upon the stillness with 

 which the solution is kept while cooUng, and other circumstances. 

 One part, however, -noil form a stiiF jelly with 500 of water. 

 Again, when a concentrated hot solution in water is boiled down, 

 the apiine precipitates as a flocculent whitish powder. 



3. hi cold alcohol apiine is more soluble than in cold water, 

 and this constitutes one of the remarkable differences between it 

 and pcctine. A quantity of apiine was dissolved in hot alcohol 

 of 75 per cent., and the solution allowed to cool to about 60° F. 

 A considerable precipitate fonned. 60 gnns. of the filtered so- 

 lution, on evaporation in a water-bath, left 0-1542 gnu. There- 

 fore 100 parts of alcohol of 75 per cent, dissolve 0"3 of apiine ; or 

 one part of the latter is soluble in 333 parts of spirit of wine 

 at 60°. 



4. In boiling spirit, apiine dissolves in considerable quantity, 

 the boiling-point of a concentrated solution being appreciably 

 above that of water. After ih-ying at 212°, it requires protracted 

 boiling for complete solution. This solution forms a stifi^ jelly 

 or a gelatinous precipitate on cooling, according to the quantity 

 dissolved. 



^^Tien the apiine is pure, the solution is colourless, or nearly 



