[ 83 j 
SECTION XXL. 
ConjeHures, why fome waters, as dif 
tilled, boiled, and /ome other wa- ~ 
ters, do not promote, but impede + 
the operation of the planis in yield- — 
ing depblogifiicated air. 
A$ I think I have proved clear- 
ly enough. that the dephlogitticated | 
air Viekied by plants is air elaborated 
by a kind of vital motion, carried - 
on. in the fubftance of the leaves, 
and kept up by the influence of the 
light of the fun, it feems that no 
more is required to collect this air 
than) to. prevent its diffufing itfelf 
through the common mafs of the 
atmofphere. Water feems the moft- oe 
appropriated. body.,for fuch an in- 
tention, for it is not haa ful LI 
