[ m ] 



turate the two meafures of common 

 air ; and thus, after the fatura- 

 tion of the two meafures of com- 

 mon air is compleated, there will 

 remain in the great meafure, or 

 tube, a column of air fo much the 

 longer as the nitrous air employed 

 was the weaker. I will illuftrate 

 it with an example : let us fuppofe, 

 that after the three meafures of 

 ftrong nitrous air are let up, and the 

 faturation of the two meafures of 

 the air under examination be com- 

 pleated, the remaining column of 

 air be found equivalent to three 

 meafures, and eight fub-divifions, 

 or to 308 fub-divifions ; this num- 

 ber, fubtracted from the 500 parts 

 or fub-divifions of both airs em- 

 ployed, will give a refult of 192, 

 which is exactly the quantity of 

 both airs deftroyed. Let us now 



again 



o 



