
338 Mr. Warer’s Thoughts on the conflituent 4 
fhall not enter into any detail of them; but {hall mention the — 
general phenomena which I obferved, and which relate to the © 
iene fubject. : 
The earths I ufed were magnefia alba, calcareous caves and — 
we a. ee. Pe 
minium or the red calx of lead. I diflolved them in the re- 
{pedtive experiments i nitrous acid dephlogifticated by boiling, — 
and diluted with proper proportions of water. JF made ufe of © 
glafs retorts, coated with clay; and I received the air in glafs 
veflels, whofe mouths were immerfed in a glazed éarthen ba- © 
fon, containing the fmalleft quantity of water that’ could be 
afed for the purpofe. As foon as the retort was heated a little. 
above the heat of boiling water, the folutions began to diftil 
watery vapours containmg nitrous acid. Soon after thefe va- 
pours ceafed, yellow fumes, and in fome of the cafes dark red 
fumes, began to appear in the neck of the retort; and at the © 
fame time there was a production of dephlogifticated air, which 
Was greater in quantity from fome of thefe mixtures than from 
others, but continued in all of them until the fubftances were 
reduced to drynefs. I found, in the receiving water &c. very 
nearly the whole of the nitrous acid ufed for their fokution, but 
highly phlogifticated, fo as to emit nitrous air by the applica- 
tion of heat; and there is reafon to believe, that with more: 
precaution the whole might have been obtained. | 
8. As the quantity of dephlogifticated: air produced: by thefe 
procefles did not form a fufficient part of the whole weight, to” 
enable me to judge whether any of the real acid entered intor 
the compofition of the air obtained, I ceafed to purfue them) 
further, having learned from them the fact, that however much’ 
the acid and the earths were dephlogifticated before the folution, the 
acid always became highly phlogifticated in the procefi.. 



