ARTIFICIAL TAN. il9 



Benzoin, after the fublimation of ferae benzoic acid, yielded -*and benzoin, 

 a refiduum, which yielded with water a pale yellow folution, 

 of a very bitter flavour. 



This folution with fulphate of iron produced a flight pale 

 yellow precipitate. With nitrate of lime, no effedl. WitK 

 muriate of tin in folution, a fmall quantity of brownifti white 

 precipitate. With acetite of lead, a copious pale yellow pre- 

 cipitate. And with folution of ifinglaO, a denfe pale yellow 

 infoiuble precipitate. 



E. Balfam of Tolu afforded benzoic acid, and the folution 

 of the reiiduum precipitated that of gelaten. 



F. One hundred grains of dragon's blood in powder mixed —^'^^ dragoR's 

 with one ounce of nitric acid, evolved much gas ; an ounce 



of water was then added ; and the digeftion in a fand bath 

 being continued, after it produced chaficcation on the dry yel- 

 low mafs that remained, a brilliant feather-like fublimate arofe, 

 which weighed rather more than fix grains and had the afpeft, 

 odour, and properties of benzoic acid. 



The refiduum, of a brown colour, formed with water a 

 gold coloured folution, which was not affected by nitrate of 

 lime: But with fulphate of iron, and with muriate of tin it 

 formed brownifli yellow precipitates j and with acetite of lead 

 one of a lemon colour. 



Gold was precipitated by it in the metallic flate, and the 

 containing glafs coloured purple; and with diffolved ifinglafi 

 it produced a deep yellow infoiuble depofit. 



As dragon's blood (imply expofed to heat did not produce 

 any benzoic acid, the author is inclined to believe, that in the 

 firft experiment this acid was obtained as a product, and not as 

 an eduft. 



G. Gum ammonia gave a brownifh yellow, bitter aftrin and gum sm- 



gent folution ; which with fulphate of iron became of a darker "^°"'^» 

 colour, but produced no precipitate. 



With nitrate of lime, a flight precipitate. With muriate of 

 tin and acetite of lead, copious yellow precipitates ; and with 

 gelaten a bright yellow infuluble depofit. 



H. Alfa tostida yielded a folution vvliich precipitated gelaten — and affa fa- 

 in a fimilar manner to that defcrlbed. ^"*^* 



I. Solutions of clemi, tacamahac, olibarum, fandarach. Solutions of 

 copaiba, mafiich, myrrh, gambauge, and cacutchonc, al-f'^'"'' tacaira- 



hac, &c. did noC 

 though aifsft gelaten^ 



