442 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



ash, yellow ; on warming, brown. Not precipitated by tannin. 

 Colored red by nitric acid of 1.42. sp. gr. Gentianine. (?) 



(Besides, possibly, a residue of Capsicine.) 



III. Residuum from evaporation of the chloroform extract: 



1. Crystalline, (a) Without alkaloid reaction. Gives a 

 beautiful yellow solution with sulphuric acid. Mixed with 

 nitrate of potash, then moistened with sulphuric acid, and 

 finally treated with a concentrated solution of caustic soda, 

 becomes brick-red. Picrotoxine. 



(b) With alkaloid reaction. Opium alkaloids. 



2. Amorphous. Residues unextracted by petroleum mani- 

 festing the same reactions as in II., viz., of Aloetine and 

 Daphnine; also of Quassine and Cnicine, and the greater part 

 of Menyanthine, insoluble in ether; and of Absinthine and 

 Colocynthine, and the greater part of Erythrocentaurine, 

 soluble in ether. 



B. Shaken with an ammoniacal solution. 



1. Residuum from evaporation of the benzine extract: 

 Crystalline. 1. Dilates the pupil, (a) Its aqueous solution 



is not precipitated by bichloride of platinum. Its solution 

 in sulphuric acid emits a peculiar odor when heated. 



Atropine, 

 (b) Precipitated by bichloride of platinum, if exactly the 

 proper quantity of the reagent is employed. Ilyoscy amine. 



2. Does not dilate the pupil. The sulphuric-acid solution 

 becomes blue with eerie oxide. Strychnine. 



II. Residuum from evaporation of the chloroform extract : 



1. Sulphuric acid produces a colorless solution in the cold. 

 (a) The solution is also but slightly colored by heating, and 

 after cooling is rendered violet by nitric acid. Sesqui-chlo- 

 ride of iron renders the substance blue, and Frohde's reagent 

 affords immediately a violet solution of it. Morphine. 



(b) The solution becomes violet on warming. Papaverine. 



2. Sulphuric acid produces a grayish-brown solution, which 

 becomes blood-red on boiling. Narceine. 



III. Residuum from evaporation of the amylalcohol extract : 

 Sulphuric acid forms a pure red solution at once. Warming 

 with sulphuric acid and bichromate of potash develops the 

 odor of salicylous acid. Salicine. 



Unless the presence of salicine is suspected, this extract 



