217 



i'.T. Scoi'ARiN. C 21 H 22 10 . 



a. Pale yellow powder. 



Note. This substance is described in Pharmacographia, p. 149, as an 

 indifferent or somewhat acid body. 



ALDEHYDES. 

 ACETIC SERIES. C n H 2n 0. 



498. ACETIC ALDEHYDE. C 2 H 4 0. 



a. Pure, a colourless liquid. 



499. ALDEHYDE-AMMONIA. NH 4 C 3 H 3 0. (Ammonium Aldehydate.) 



a. Brownish crystals. 

 Note. This specimen was colourless when first obtained. 



500. ACETAL. C 6 H U 0. 



a. Colourless liquid. 

 Note This liquid is a compound of aldehyde with ethjl oxide. 



501. CHLORAL. C 2 H(C1 3 )0. (Tri chlorinated Aldehyde). 



a. Anhydrous, an oily liquid. 



b. Hydrated, in crystals. (Liebrich's Chloral Hydrate.) 



c. Ditto, in crystalline cakes. (ChloralUydrate.) 



502. BUTYL CHLORAL. C 4 H 6 (C1 3 ) 0. (Croton Chloral.) 



a. White crystalline powder. 



Note. For method of manufacture, see WatU, Diet. Cliem. Supplt., i. , 

 p. 618 ; P. J. [3], vol. ii., pp. 425, 434. The croton chloral of commerce 

 has lately been found to consist of butyl chloral ; see P. J. [3] , vol. vi., 

 p. 666. 



FURFUROL SERIES. C n H 2n _ 0,. 



503. FUBFUROL. C 5 H 4 2 . (Aldehyde of Pyromucic Acid.) 



a. Brownish aromatic liquid. 



Note. The odour of this liquid has been compared to that of oil of 

 cassia. When pure the liquid is pale yellow. This specimen is some of 

 the first made in this country, and was prepared by the late Mr. Morson, 

 at the request of a customer, that he should distil together some sulphuric 

 acid and bran, in order to produce a liquid for medicinal use in skin 

 diseases. 



BEN ZOIC SERIES. C^R^-sO. 



504. BENZOIC ALDEHYDE. C 7 H 6 0. (Essential Oil of Bitter Almonds.) 



a. Obtained from bitter almonds by distillation with water. 



b. Ditto, freed from hydrocyanic acid. 



505. SALICYLIC ALDEHYDE. C 7 H 6 S . (Salicylol, Salicylous acid, 



Hydride of Salicyl.) 

 a. Fragrant, colourless liquid. (Oil of Meadou'sweet.) 



