Analyfis of the Air. 197 



Experiment LXXX. 



Iputintothebolthead b (Fig. 34.) 16 cu~ 

 bick inches of Sheeps blood, with a little 

 water to make it ferment the better. I 

 found by the defcent of the water from z 

 to y that in 1 8 days fourteen cubick inches 

 of air were generated. 



Experiment LXXXI. 



Volatile Salt of Sal Ammoniac, placed in 

 an open glafs ciftern, under the inverted 

 glafs z z a a (Fig. 35.) neither generated 

 nor abforbed air. Neither did feveral other 

 volatile liquors, as fpirits of Harts-horn, fpi- 

 ritsof Wine, nor compound Aquafortis, ge- 

 nerate any air. But Sal Ammoniac, Sal 

 Tartar, and fpiris of Wine mixed together, 

 generated 26 cubick inches of air, two of 

 which was in 4 days reforbed, and after that 

 generated again. 



Experiment LXXXII. 



Half a cubick inch of Sal Ammoniac, and 

 O 1 double 



