tO 
Sir Benjamin Thompson’s Experiment 
~ Experiment N° 23. 
Surprifed at the fm'allnefs of the quantity, and the inferior 
quality, of the air produced in the. Taft, experiment, I was in- 
• duced to repeat it; accordingly, * the globe being again filled 
with water, and a quantity of frefh conferva rivularis (a final! 
: handful), and being expofed to the action of the fun’s rays 
t during 3 fine days, 1 3 pp 0 - cubic inches , of air were produced, 
\%vhich, proved with nitrous air, gave \a-\-yi~ 1,54, or 246. 
At the end of the experiment the water appeared to be very 
; faintly tinged of a greenifh call. 
The two following experiments were made-m pen the 20th 
, and 2 1 ft of AugufL 
"Experiment N° 24. 
t 
A globe, about 4I inches in diameter (contents 46 cubic 
I Inches) being Riled with frefh fpring water, and 30 grains of 
, raw filk which had been ufed in many preceding experiments, 
and being expofed to the aflioir of‘ the fun’s rays two days, in 
all about 8 hours of funfhine, the weather being cloudy great 
part of the time, i T -|o cubic inch of air was produced, 
which, proved with nitrous air, gave i<2 + 3«= 1,96, or 
204. 
‘Experiment N° 25. 
At the fame time an equal globe, containing frefh fpring 
water, and about 1 5 grains of poplar cotton (which had like- 
wife been ufed in former experiments) produced i-,~ cubic 
inch of air, which, proved with nitrous air, gave ia+ 7 ) n= : 
1,40, or 260. 
The 
