on Hepatic Air . / 153 
The water, thus impregnated, had exadtly the fmell of onions* 
It turned tincture of radifhes green. 
It precipitated folution of Jilver black ; and that of copper in 
the nitrous acid brown ; but this precipitate was re-diffolved by 
agitation, and the liquor became green. Sublimate corrofive 
was precipitated yellow mixed with black. 
Iron was precipitated white, both from the vitriolic and 
marine acids ; but a pale yellow folution of it in the nitrous 
acid was not affected ; and a red folution of it in the fame acid 
was only congrumated. 
Regulus of antimony in aqua regia gave a white, cobalt in 
nitrous acid a very flight reddiflh, and bifmuth in the fame acid 
a brown precipitate. 
But neither the nitrous folution of lead or zinc, nor that of 
tin in marine acid or aqua regia, nor that of regulus of anti- 
mony in aqua regia, were any way affedted. 
Fixed air , mixed with an equal proportion of phofphoric air, 
produced a white fmoke, fome diminution, and a yellow de- 
pofit. On agitating the mixture in water, the fixed air was 
taken up all to one-tenth. The refid u urn. fmoked, but did 
not inflame fpontaneoufiy. 
To a fmall portion of phofphoric air I introduced fome 
precipitate per fe . It foon grew black, and a white fmoke 
appeared. In two days the precipitate remained folid, yet 
acquired a fhining pale white colour, like that of fteel : the 
air loft its fpontaneous inflammability ; but I am not certain 
that this want of inflammability did not proceed from fome 
other caufe ; for two days after I made this air, I found a quan- 
tity of it, which had refted all night on water, had depofited a 
yellow fcum on the fides of the jar, and loft its fpontaneous 
inflammability next morning. The temperature of the air was 
Vol. LXXVI. X then. 
