238 On the Animal Calculus. 
4. And from the fame Qiiantity of a tranf- 
parent Trapezium like Spar, which came from 
the Mountains in Switzerland^ two hundred 
and eighty eight Cubes of Air were raifed, of 
which ninety Cubes loft their Elafticity in five 
Days, It was obfervable that the Air Bubbles 
which retained their Form for fome time, did 
when their vifeid covering was burft, emit 
Smoak, in the fame manner as diftilled Hart’s* 
horn did in Exper. 77. Fbl ijl, p, 189. 
5. From a like Quantity of Selenites there 
arofe in Diftillation, but thirty nine cubic In- 
ches of Air, of which nine loft their ElaftU 
city in five Days. 
6 . From one hundred and forty fix Grains, 
or near -d of a cubic Inch of Chalky there 
arofe in Effervefcencc, with two Cubes of Spi- 
rit of Salt, eighty one Cubes of Air, of which 
thirty fix loft its Elafticity in nine Days. 
7. From a like Qiiantity of a Corratine 
Stone and Spirit of Salt arofe two hundred and 
eighty eight cubic Inches of Air, of which 
a hundred and fixty two loft their Elafticity in 
feven Days. 
8. From Bvrbeck Scone with Spirit of Salt 
a hundred and eighteen Cubes of Air, the great- 
eft Part of which loft its Elafticity in feven 
Days. 5?. From 
