E 58 ] 



and fal ammoniac powdered ; the globe thus pre* 

 pared, was fufpended in the air about five yards 

 from the furface of the ground; the cold produced 

 by the ice and neutral fait congealed the moifture 

 of the air on the external furface of the globe in 

 the form of ice. This condenfed body was care- 

 fully fcraped off with a fiber fpatula, and 

 received into a wide-mouthed bottle well rinfed : 

 when I had collected in this manner fome ounces 

 of condenfed matter, I proceeded on the follow- 

 ing experiments. 



EXPERIMENT I. 



To know if it contained any fixed air, I put 

 one ounce of the condenfed moifture into a vial, 

 the cork of which was perforated through the 

 whole length, to admit the extricated air to pafs 

 through : over the cork was tied a loofe bladder 

 free from any air ; I then placed the vial, thus 

 prepared, in boiling water ; the heat of the water 

 extricating the fixed air from the condenfed 

 moifture, it efcaped through the perforation of 

 the cork into the bladder, where it was col- 

 lected the quantity of this air occupied a fpace, 

 which of fimple diftilled water was equal in bulk 

 to 1 I drachm. The vial, upon weighing it 

 after the feparation of the air, was reduced a 

 few grains lighter. 



To be more certain that a great part of this 

 extricated air was fixed, I applied it to lime- 

 water; a precipitation of calcareous earth en- 

 fued, which convinced me of its prefence. (See 

 Seft. IV. page 29,) 



EXPfc 



