68o Col. roy’s Experiments for 
+ 1 4° ; the temperature of the air, and alfo of the ftandard 
barometer, being at the fame moment 49°^-. The ob- 
ferved condenfation, arifing from this difference of 35 0 -', 
was JtLths of an inch; or .1189, when reduced for the 
height of the barometer, which then flood at 30.296. 
Hence the condenfation for 3 2 0 is .1072, or .00335 for 
each degree. In this day’s experiment, when the tempe- 
rature of the mixture had rifen to 3 2 0 , that of the air 
and ftandard barometer was 52°^; whence the reduced 
difference, for the 20° between 32 0 and 52°, was found 
to be .0664, anfwerable to former experiments. 
The fame experiment was repeated two days after, 
with great care, the veffel being filled no higher than the 
furface of the quickfilver. The mean temperature of the 
mixture was now + 4% and that of the ftandard barome- 
ter 49 0 ’-. The obferved condenfation, arifing from this 
difference of 45°^, was or .1594, when reduced for 
the height of the barometer, then ftanding at 30,416: 
hence the rate for 32 0 is .1127, or .003,522 for each 
degree. When the temperature of the mixture had 
rifen to 32 0 , that of the air was 51 0 : whence the aug- 
mented rate for the 2 o°, between 32 0 and 5 2 0 , was found 
to be .0662. 
From the mean of thefe two experiments it appears, 
that the condenfation of a column of 30 inches of 
quickfilver 
