



3 



i8 



Of Vegetation. 











o3 Experiment CXXII. 



3ri That the leaves of plants do imbibe claf- 

 tick air, I have ibme rcafon to fufped from 

 the following Experiment, viz. In May I 

 fet fomc well rooted plants of fpcar-mint 

 in two glafs citterns full of water, which 

 citterns were fet on pedcftals, and had in- 

 verted chymical receivers put over them, as 

 in (Fig. 35.) the water being drawn up to 

 a a, half way their necks: In this inclofcd 

 moitt ftate the plants looked pretty florid 

 for a month, and made, as I think, fomc 

 few weak lateral fhoots, tho' they did not 

 grow in height ; they were not quite dead 

 till after fix weeks, when it was found that 

 the water was rifen in both glafles from 

 a a towards z z, in bulk about 20 cubick 

 niches : But as there was not fo exaftan ac- 

 count taken of the different temperature of 

 the air, as to heat and cold, as there ought 

 to have been, I am not certain, whether 

 that rifing of the water might not be owing 

 $ a greater coolnefs of the air at the fix 

 V^ekscnd, than when they were firft placed 

 u*der the glades 5 and therefore do not de- 

 pend 







