t oo 3 
operation, fo as to produce quite the 
reverfe, and to obtain a poifonous 
air inftead of dephlogifticated air: 
for the evaporation of bad air in 
the dark depends on the vital mo- 
tion within the plant, which, being 
not influenced by the light of the 
fun, produces a contrary effect. 
Thus a plant growing in an abfolute 
darknefs is without green colour, 
and fruit without the influence of 
the light has no flavour. 
