on the Production of Dephhgijlicated Air* 109 
The two following days, the weather being very fine, it 
furnifhed 3 cubic inches of air, which, proved with nitrous 
air, gave itf-P4«=r 1,5 8, or 342. 
Expert me tit AT 1 9. 
The globe being again filled with frefh water, and the fame 
filk well wafhed, and being expofed 2 days in the fun, it gave 
2-p~ cubic inches of air, which, proved with, nitrous -air, gave 
2^4-3^= 1,67, or 233. 
Experiment N° 20. ■ 
A like globe, with frefh water, and an equal quantity of ’ 
poplar cotton which had been ufed in former experiments, * 
being expofed at the fame time, gave cubic inches of air* 
whofe quality was la + ^n^ 1,20, or 280. 
Experiment AT 21. 
% ** 
A frnall globe, contents 20 cubic inches, with 17 grains of 
raw filk, expofed at the fame time, gave 1 cubic inch of air* . 
which turned out \a + yi— 1 ,3 7, or 263. 
Experiment N° 22. 
A large globe, containing 296 cubic inches, being filled 
with frefh water and a frnall quantity of conferva rivularis 
and expofed at the fame time with the three globes above-men- 
tioned, gave 1 1 cubic inch of air, which, proved with ni- 
trous air, gave itf + 2»= 1,76, or 124. 
The water in this experiment was changed to a brown co- 
lour, owing, as I conceived, to the too great heat the conferva 
acquired in the fun. 
Thefe experiments were made between the 2d and the 5th 
of July. 
Expe- 
