[ 447 ] 
ference of the quantity of the adtion of the humor. 
The hygrometer which remained at the loweft was 
the one that was always in the fhade, and was not 
mounted. It was the fame upon which I had made 
my obfervations in the mountains of Sixt. I fuf- 
pended them both in the garden I have been fpeak- 
ing of, about 6 in the morning ,• the plants were 
covered with dewj the fun, being juft rifine, could 
not yet fhine on the garden. As foon as the hygro- 
meters were expofed in the open air, they both fell 
very rapidly, but the one which was without the frame 
fell much^ fafter than the other. They both were 
continuing to fall, when the fun began to fhine in 
the garden. The following is an account of their 
progrefs, and of that of the thermometers during 1 9 
hours. The adion of the heat upon the mercury 
of the hygrometer is correded upon each of them, 
from the oblervation of the thermometer joined to it, 
lo that there only remains that of the humor. 
& Table 
