[ 28 ] 
SEC TLION-— Yi. 
The production of the depblogifticated 
air from the leaves is not owing to 
the warmth of the fun, but chicfyy, 
if not pg to the light. 
IF the fun Said this ait to ooze 
out of the leaves by rarifying the 
‘air in heating the water, it- would 
follow that, if a leaf, warmed in 
the middle of the fun-fhine upon 
the tree, was immediately placed in 
water drawn direcily from _ the- 
pump, “and thus being very cold, 
the air bubbles would not appear 
till, at leaft, fome degree of warmth 
was communicated to the water; but | 
quite the contrary happens. The — 
leaves taken from trees or plantsin 
the miditof awarm day, and plunged “3 
I im- 
