K. DOMESTIC AND HOUSEHOLD ECONOMY. 441 



odor of others, although the latter is but imperfectly accom- 

 plished, on account of empyreumatic matter present in the 

 beer. The residual aqueous liquid was afterward treated 

 with benzine and chloroform in the same manner as with the 

 petroleum, and subsequently rendered alkaline with ammonia, 

 and repeatedly extracted with petroleum, benzine, and chlo- 

 roform. The final results, together with some of those of 

 Drao-endorff, are o-iven in full in the annexed table. 



A. Shaken with an acid solution. 



I. Residuum from evaporation of the petroleum naphtha 

 extract : 



1. Crystalline, yellowish, difficultly volatilizable. The so- 

 lution in sulphuric acid remains yellow ; cyanide of potas- 

 sium and hydrate of potash color it blood-red on warming. 

 It colors cotton yellow. Picric acid. 



at 



2. Amorphous, white, of pungent taste, and reddening the 

 skin. Capsicine. 



II. Residuum from evaporation of the benzine extract: 



1. Crystalline, (a) Not bitter; colored purple by caustic 

 potash. Aloetine. 



(b) Bitter; colored yellow by caustic potash; after warm- 

 ing, brown. Daphnine. 



2. Amorphous, (a) Colored reddish-brown by sulphuric 

 acid; precipitated by tannin. Quassine. 



(b) Gives the odor of Menyanthis oil when heated with 

 dilute sulphuric acid, while the liquid becomes turbid, and 

 oily globules separate. Menyanthine. 



(c) Colored blood-red, afterward brownish-red, by sulphu- 

 ric acid. Hydrochloric acid affords a greenish solution ; aft- 

 er warming, brown and turbid, with the separation of oily 

 globules. Onicine. 



(d) Brown solution with sulphuric acid, subsequently vio- 

 let. Similar reactions with Frohde's reagent. Absinthine. 



(e) Deep-red solution with sulphuric acid ; a beautiful cher- 

 ry-red with Frohde's reagent; precipitated yellowish-white 

 by tannic acid. Colocynt/nne. 



(f) Colored brown by sulphuric acid ; greenish solution 

 with hydrochloric acid; becoming brown and turbid on warm- 

 ing. Erythrocen taurine. (?) 



(g) Colored pure brown by sulphuric acid ; by caustic pot- 



T 2 



