[ts J 
{pheric air, become exhaufted. This 
ait, gathered in this manner, is 
really dephlogifticated air, of a more 
or leis good quality, according to 
the nature of the plant from which 
the leaves are taken, and the clear- 
nefs of the day-light to which they 
were expofed. 
It is not very rare to fee. thefe 
bubbles fo quickly fucceeding one 
another, that they rife from the fame 
{pot almoft in a continual ftream: 
I faw this more than once, princi- 
ped in aac tate alba. 
a eet a, ae ey ae a ae 
, SE = 
