368 Analysis of iiEbGE hyssop, 



wlien placed on a live coal, that it could be nothing' but 

 the mucous acid, notwithstanding I found it impossible to 

 demonstrate it. 

 Oxatateoflime. As to the substance that was not dissolved by the ammo- 

 nia, I satisfied myself by various experimentSj that it was 

 oxalate of lime. 



lUalateoflime, The presence of lime in this white powder indicates, thatthe 

 alcohol had precipitated with the gum some malate of lime, 

 which in fact is not soluble in that liquid. The yellow 

 liquor decanted from the white powder contained also oxa- 

 late of lime in solution, free oxalic acid, and yellow bitter 

 matter: for ammonia threw down from it a white granular 

 precipitate; the filtered liquor was afterward rendered 

 turbid by lime-water ; and the solution still remained yellow 

 and bitter. 



Themucous The mucous matter of hedge hyssop, which was sepa- 



rated from the bitter principle by means of alcohol, as said 

 above, contained therefore lime in combination with ant 

 acid; and probably a small quantity of vegeto-animal matter, 

 which formed the yellow bitter matter by the alteration it 

 underwent in the nitric acid. 



The green resin The green resin of hedge hyssop exhibited nothing pecu- 

 liar. Like that of other vegetables, it is soluble in alcohol, 

 in alkalis, and in fats. 



Soluble princi- The experiments I have made on hedge hyssop, the chief 



hyssop. ^^^ of which I have here related, show, that this plant contains 

 the following soluble principles, which are consequently 

 found in its expressed juice : 1, a gummy matter of a brown 

 colour ; 2, a resinous matter ; which differs however from 

 most resins in being soluble in a large quantity of water, 

 particularly when heated ; much more soluble in alcohol ,, 

 than in Mater, and of aft extremely bitter taste : 3, a small 

 quantity of animal matter : 4, muriate of soda in pretty large 

 -^. quantity: and, 5, a salt with base of potash, which I 



suspect to be a malate. I detected the existence of this 

 salt by means of solution of platina, and simple sulphate of 

 alumine. 



SoTubility of th« It appears, that the solubility of the resin is increased by 



resin. the presence of the gummy matter, and of the salts; for, j 



Mhen it is freed from these, it can no longer be dissolved ia 



water, 



