on Hepatic Air, 
when three meafures of common and one of hepatic air were uled. ' 
Water took up the hepatic air. No fixed air was found. 
Five meafures of hepatic, and five of dephlogiJUcated air fo 
pure that one meafure of it and two of nitrous air made only 
three-tenths of a meafure, remained unaltered for eight days, 
the mercury only being blackened. No fixed air was produced, 
nor the dephlogifticated air phlogifticated. When the mixture 
was fired, it went off all at once with a loud report. 
Four meafures of phlogifticated and four of hepatic air re- 
mained undiminifhed for fixteen days : water then took up the 
hepatic, and left the phlogifticated air. 
Four meafures of hfiammable and four of hepatic air remained 
unaltered for fix days. 
Two meafures of hepatic and two of marine acid air fuffered 
no diminution in three days. The mercury on which they 
flood was not blackened. Water took up both, and precipitated 
the folution of filver black. 
The fame quantity of hepatic and fixed air remained four 
days without any fenfible diminution. Four meafures of water 
abforbed the greater part of both, had an hepatic fmell, preci- 
pitated lime from its folution, and alfo filver, as ufual. The 
refiduum extinguiftied a candle. 
But vitriolic , nitrous , and alkaline airs had very remarkable 
effedls on hepatic air. 
Two meafures of hepatic being introduced to two of vitriolic 
air , a whitilh yellow depofition immediately covered both the 
top and fides of the jar, and both airs were, without any agi- 
tation, reduced to little more than one meafure ; but the opa- 
city of the incrufted glafs prevented my then afcertaining the 
diminution with precifion. Hence I repeated this experiment 
more at large, in the following manner. To five meafures of 
vitriolic air (each meafure containing a cubic inch) I added one 
S 2 of 
