142 Mr . Kirwan's Experiments 
antimony , red and yellow ; that of plaiina , red mixed with 
white. 
The folution of fiher in the nitrous acid, and alfo that of 
lead, whether in the acetous or nitrous acid, are precipitated 
black. If the folutions are not perfeftly faturated with metal, 
the precipitates will be brown or recldifh brown, and may be re- 
diffolved by agitation. 
The nitrous folution of mercury is precipitated of ayellowifli 
brown ; that of fublimate corrofive, yellow mixed with black ; 
but by agitation it becomes white. 
The nitrous folution of bifmuth becomes, by mixture with 
this water, reddifh brown, and even aflumes a metallic ap- 
pearance; that of cobalt becomes dark ; that of zinc, of a 
dirty white ; that of arfenic , in the fame acid, yellow mixed 
with red and white, orpiment and realgar being formed. 
If oil of vitriol , whofe fpecific gravity is 1,863, be dropped 
into hepatifed water, it renders xt '{lightly turbid .; but, if the 
volatile vitriolic acid be dropped into it, a bluifli white and 
much denfer cloud is formed in the water. 
Strong nitrous acid , whether phlogifticated or not, caufes a 
copious white precipitation ; but dilute nitrous acid produces no 
change. Green nitrous acid, whofe fpecific gravity was 1,328, 
Immediately precipitated fulphur from it. 
Strong marine acid produced a flight cloud ; but neither 
diftilled vinegar nor acid of fugar had any effedt. 
It is faid by Mr. Bergman, that hepatifed water in a well 
clofed veffel effects a folution of iron in a few days; but this 
experiment, on repeated trials, did not fucceed with me : nor 
could I diffolve any other metal in this water ; the fulphur 
indeed unites to many of them, but forms an infoluble mafs ; 
2 > ’ fa 
