ae ge | 
turate the two meafures of common 
air; and thus, after the fatura- 
tion of the two meéafures 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, 3 
which is exactly the quantity of 
both airs deftroyed. Let us now 
again 
