358 ANAL-tSIS OF AtOES. 



4. The hepatic differs from the succotrinc aloes in con^ 

 taining some albuminous animal matter, and less resin. 



5. It does not dissolve completely in boiling water, be- 

 cause the heat coagulates the albumen. 



6. Neither is it totally soluble in alcohol. This readily 

 distinguishes it from succotrine aloes. 



7. The saponaceous principle* and resin appear to be 

 of the same nature in both kinds. 



8. Succotrine aloes consists of 75 parts of bitter sapona^* 

 ceous principle, 25 parts resin, and a trace of gallic acid, 



9. Hepatic aloes contain 81 -25 saponaceous principle, 

 6*25 of resin, 12'5 of albumen, and a trace of gallic acid. 



Messrs. Lagrange and Vogel experimented on much larger 

 quantities than either Braconnot or Trommsdorff. They 

 distilled a kilogramme [near 2| lbs avoird.] of each kind 

 in a large glass retort. Toward the end of the process a 

 shining black substance sublimed, which was nothing but 

 aloes. The water from the dry distillation of the hepatic 

 aloes they say was perceptibly ammoniacai ; that from the 

 succotrine merely exhibited a white vapour with muriatic 

 acid, after the addition of a little pure potash. 



They afterward distilled a similar quantity of each, pre- 

 viously diluted with a quart of water. The succotrine aloes 

 yielded a liquid not acid, of a very sweet and pleasing 

 smell, on which floated a volatile oil of a greenish yellow 

 colour, and smelling like that of meHlot. It also cou- 

 tained some other substance, as Trommsdorff observed, for 

 after some time it grew cloudy. 

 Hepatic, 'The water from the hepatic aloes was not pleasing to 



the smell, but rather nauseous, approaching a little to that 

 of prussic acid. There was no trace of oil ou its surface or 

 in solution. 



Component 

 parts of snc- 

 cotriae 

 and liepatic 

 aloes. 



Bo\iillon-La- 

 ^range and 

 V ogel's analy 

 by dry dis- 

 tillaiion, 



and by wet. 



Sxifco trine 



aloes. 



Saponaceous * ^^^ author having dissolved a portion of aloes by boiling in 



principle of 12 parts of water, a fourth part of the aloes separated on cooling, 

 plaius. y]je aqueous solution being evaporated to dryness, a bitter 



substance rosenibling aloes remained, which was conipletelv soluble 

 in alcohol, but altogether insoluble in ether. Hence he supposes it 

 to be the saponaceous principle of Hermbstaedt, seij'cnstuff', or 

 pflanzenaeif, which is thus characterized, and occurs in various 

 vee;etables, as salfrou, rhubarb, &c. He supposes there are dil- 

 lerent jpecies of it, more or less bitter to the taste. 



They 



