21 
the Attractive Powers of Mineral Acids, 
Tin in the nitrous acid,. 
ioo grs. of tin require, for their per fed folution, 1200 gts. 
of real nitrous acid, whofe proportion to water Ihould be at 
lead as 1 to 25, and tire heat not exceeding 6o° : the quantity 
of air afforded by fuch folution is only ten cubic inches, and it 
is not nitrous. The folution is not permanent ; for in a few 
days it depcfits a whitifh calx, and if the weather be warm 
burfts the phial. The calces of tin are infoluble in this acid. 
Tn in the marine acid, 
100 grs. of tin require for their folution 413 of real marine 
acid', whofe proportion to water is as 1 to 4!, and alfo the 
afliftance of a moderate heat. This folution affords about 90 
cubic inches of inflammable air and io of marine air. The 
calces of tin are nearly infoluble in this acid. 
Lead in the vitriolic acid, 
100 grs. of lead require for their folution 600 grs. of real 
acid, whofe proportion to water is not lefs than that of 1 to 
> f 7 0 -, and better if the quantity of w r ater be ffill lefs ; and 
hence, as with regard to copper, a greater quantity of lead 
fhould be employed than is expeded to be diflolved. A ffrong 
heat is alfo requilite, and hot water fhould be added to the cab- 
cined mafs, though fparingly, as it occafions lome precipita- 
tion. 
This metal is alfo foluble, but in a very fmall degree, in 
dilute vitriolic acid ; for it effervefces with fpirit of vitriol, 
whofe fpecific gravity is only 1,275. 
Thf 
