ioo Sir Benjamin Thompson’s Experiments 
From the leaves of the peach-tree I obtained an air which, 
proved with nitrous air, gave la + i ,32, or 168; but I 
did not think it neceffary to multiply thefe experiments, par- 
ticularly as Dr. Ingen-housz and Mr. Sennebier have given 
us the refults of fo many of theirs upon the fame fubje£t, of 
the accuracy of which there is no room left to doubt. I fhall 
therefore content myfelf with referring to the refults of their 
experiments. 
With a view to determining, with greater precifion, the quan- 
tity and the quality of the air produced by a given quantity of 
water and filk, expofed for a given time to the adtion of the 
fun’s rays, I made the following experiment. 
Experiment N° 13. 
A globe of fine, clear, white glafs, about 8_V inches in 
diameter, and containing 296 cubic inches, being filled with 
frefh fpring water and 30 grains of raw filk, was expofed in my 
window three days, viz. the 12th, 13th, and 14th of May laft, 
thefe days being for the moft part cold and cloudy, with Ihort 
intervals of funfhine. Air produced 9 \ cubic inches; quality 
itf+3»=i 9 6i, or 239. 
May 15. This air being removed, and its place fupplied 
with frefh water, the globe expofed in the fun this day from 
nine o’clock in the morning till five o’clock in the afternoon, the 
weather being very fine, yielded 8 cubic inches of air, 
which, proved with nitrous air, gave 1^ + 4^= 1,74, or 326. 
The heat of the water in the globe, during the experiment, was 
from 7 o° to 98" F. The water had now loft confiderably of 
its tranfparency, and had affirmed a light greenifh hue. 
May 16. The air furnifhed yefterday being removed, the 
globe furnifhed this day, during fix hours of funfhine, 9 cubic 
3 inches 
