[ 299 1 



The reft of the figures are only 

 intended for thofe who fhould like 

 to engage farther in this entertain- 

 ing branch of natural philofophy, 

 and to produce thofe kinds of air 

 which are liable to be altered or 

 abforbed by water. 



Fig. X. A wooden trough to be 

 filled with mercury, for fuch ex- 

 periments with air as cannot be 

 done in water. Many kinds of airs 

 are abforbed themfelves by water, 

 as is fixed air, and all thofe aerial 

 fluids which fhould rather be clafTed 

 among vapours, as alkaline air, 

 acid air, &c. of which an account 

 may be feen in the works of Dr. 

 Prieftley, and which will foon be 

 treated in a more ample manner 

 by Abbe Fontana. 



Air 



