Analyfts of the Air. ip,i 
when a cubick inch of fpirit of nitre was 
poured on it, diflblve in 2 or 3 hours, with 
a large froth, and generated 48 cubick inches 
of Air, none of which loft its elafticity, tho* 
it ftood many days in the glafs veffel. (Fig. 
34.) And a like quantity of Tartar being 
mixed with fpirit of nitre, was in the fame 
time diffblved, but no elaftick Air was ge- 
nerated, notwithftanding Tartar abounds fo 
much with Air. 
Small pieces of Tartar and Calculus were 
in 12 or 14 days both diftblved by oil of 
Vitriol ; the like pieces oiTartar and Calcu- 
lus were diftblved in a few hours by oil of 
Vitriol, into whtch there was gradually 
poured near an equal quantity of fpirit of 
Harts-horn, made with Lime, which caufed 
a confiderable ebullition and heat. 
Tho* the remaining calx of the diftillation 
of Tartar-^ in Exper. 73. run per deliquiur/if 
and had therefore Sal Tartar in it $ and 
cho' the calx of the diftilled Calculus did 
not run per deliquium^ and had conlequently 
no Sal Tartar in it 5 yet it cannot thence 
be inferred^ that the Calculus is not a tar- 
tarine fubftance : Becaufe by Exper. 74. it 
is evident, that Sal Tartar it felf, when 
2 mixed 
