Anahfis of the Air. 2 1 y 



hours to generate 82 cubick inches of air 

 more ; but the following night being very 

 cold, little was generated : So the next morn- 

 ing I poured hot water into the veffel x x> 

 which renewed the ferment, fo that it ge- 

 nerated 4 cubick inches more, in all 1 30 cu- 

 bick inches, a quantity equal to 520 times 

 the bulk of the Antimony. 



The fermented mafs looked like Brim- 

 ftone, and when heated over the fire, there 

 fublimed into the neck of the bolthead a 

 red fulphur, and below it a yellow, which 

 jfuiphur, as Mr. Boyle obferves, Vol. III. 

 p. 271. cannot be obtained by the bare ac- 

 tion of fire, without being firft well digefted 

 in oil of Vitriol, or fpirit of Nitre. And by 

 comparing the quantity of air obtained by 

 fermentation in this Experiment, with the 

 quantity obtained by the force of fire in 

 Exper. 69. we find that five times more air 

 was generated by fermentation than by fire,, 

 which flicws fermentation to be a morefub- 

 tile diflblvent than fire 5 yet in fome cafes 

 there is more air generated by fire than by 

 fermentation. 



Half a cubick inch of oil of Antimony* 



with an equal quantity of compound Aqua- 



P 4. fortis 9 



