22 
Mr. kir wan’s Experiments and Obfervations on 
The calces of lead are fomething more foluble in this acid, 
loo grs. of vitriol of lead, formed by precipitation, contains 
73 of lead, 17 of real acid, and 10 of water. Vitriol of lead, 
formed by dired folution, contains a large proportion of acid. 
Lead in the nitrous acid. 
I 
100 grs. of lead require for their folution about 78 grs. of 
real acid, whofe proportion to that of water may be as 1 to 1 1 
or 12, and the affiftance of heat towards the end. This folu- 
tion affords but eight cubic inches of nitrous air. The calces 
of lead are alfo foluble in this acid ; but if much dephlogifli- 
rcated they become lets foluble. 
100 grs. of minium require 81 grs. of real acid. 
100 grs. of nitrous fait of lead contain about 60 of lead. 
Lead in the marine acid. 
100 grs. of lead require 600 grs. of real acid to diffolve 
them, when the fpecific gravity of the fpirit of fait is 1,141, 
and alfo the affiftance of heat, by which much of the acid is 
diffipated. A ftronger acid would diffolve more. 
The calces of lead are more foluble in this acid than genuine 
lead. 100 grs. minium require 327 grs. of real acid; but 
white lead is much lefs foluble. 
100 grs. of horn lead, formed by precipitation, contain 72 
of lead, 18 of marine acid, and 10 of water. 
Silver in the vitriolic acid . 
100 grs. of pure filver require to diffolve them 530 grs. of 
real vitriolic acid, whofe proportion to water is not lefs than 
that of 1 to and when fuch a concentrated acid is uled, it 
ads (lightly even in the temperature of 6o° ; but for a copious 
folution 
