[ xxxv 3 
-Hr-** 
; 
AMENDMENT to P. 191. L. 12 . 
I have lately repeated this experiment, and found that one mea- 
fure of alkaline air is faturated by lefs than half of one meafure 
of fixed air, but more than one-third, conformably to Dr. 
Priestley’s firff experiment, p. 293. ; by which it appears, 
that 100 gr. of alkaline air require about 120 of fixed air to 
faturate them: and hence 100 gr. of concrete volatile alkali 
contain about 53 of fixed air, 44 of mere volatile alkali, and 
3 of water. 
Vol. LXXII. 
F 
