54^4 AXAL-rSTS OF OLIBANUM, 



subject with more accuracy and precision, so as, I trust, 

 to confirm in a more satisfactory manner the experiments, 

 ifhich I have ventured to bring forward, and achieve th« 

 principal object of the communication. 

 I am, SIR, 



Your humble Servant, 

 S. B. 11. ' F. R. GOWAR. 



March n, 18U. 



m. 



Comparative Analysis of Gum-Resim : By Mr. IIenrt 

 BaAcoNNOT, Professor of Natural History^ ^c, 



(Concluded from p. 2370 



Art. V. Analysis of Olihanum, 



Action of heat § I. OlIBANUM is difficultly melted ; and when kindled 

 ou olibanum. j,^ ^i^^ ^1^^^^^^ ^f ^ caAdle continues to burn of itself, leaving 



white ashes. 

 Distilled with Twenty gram. [308*8 grs.] distilled with water yielded 

 wat^r, about 1 gram. [15*4] grs.] of volatile oil, of a pale lemort 



colour, and the smell of which is not unlike that of lemons. 

 »iid dry. A similar quantity distilled with the naked fire gave a 



Tery large quantity of a brown em pyreumatic oil, and an 

 acid watery liquid in no great abundance. These products 

 did not give any perceptible indications of ammonia on ih^ 

 addition of lime; but on bringing a litlle muriatic acid near 

 the mixture some slight white fumes were visible, which 

 appear to indicate the presence of volatile alkali. In the 

 retort remained a compact coal, weighing 2*5 gram. [38*6 

 grs.] which left after incineration 55^ cent. [8*5 grs.] of 

 ashes, composed of 5 cent. [0*77 of a gr.] of potash 

 partly saturated with sulphnric, muriatic, and carbonic 

 acids; 6 cent. [0*93 of a gr.] of phosphate of lime; and 

 ' 44 cent. [6*8 grs.] of carbonate of lime. 



K«?ate'l ■ h . § H. ^. 25 gram. [386 grs.] of powdered olibanum 

 alvoUot were heated with a sufficient quantity of alcohol, and fil- 



tfMd. On the filter remained a pretty copious whitish sub- 

 mit itau6« 



