Es] 
on the other irregular blifters; for 
inftance, leaves of oak, which give 
flat blifters on the under fide, and 
round bubbles on the upper fide. 
Some form only thofe irregular blif- 
ters at the upper fide, as the leaves 
of {purge, cataputia or euphorbia. 
__ Some leaves form neither bubbles 
nor biift ers on either fide, and yet 
yield a great deal of dephlogifticated 
air ; for inftance, leaves of na/turtium 
Indicum: thefe leaves feem to have 
a quality repulfive to water, which’ 
_ only forms a kind of cover over the 
furface of the leaves, without com- 
ing into immediate conta. The 
“air oozing out of the leaves floats 
under this cover, and rifes to the 
higheft part of the leaves, where it 
forms a kind of bags, which at laft 
detach themfelves from the. edge, 
and rife to the top of the jar. - “The 
leaves . 
Seis, . SF ae Gass oe 
