Of Vegetation. 327 



nate changes from hot to cold for infpira- 

 tion, and vice verfa for expiration ; and 'tis 

 not improbable, that plants of more rich and 

 racy juices m-iy imbibe and affimilate more 

 of this aereal food into their conftitutions, 

 than others, which have more watry vapid 

 Juices. We may look upon the Vine as a 

 good inftance of this, which in Experiment 

 3. perfpired lefs than the Apple-tree. For 

 as it delights not in drawing much watry 

 nourimmenr from the earth by its roots, fo 

 it mud therefore neceffarily be brought to a 

 more ftrongly imbibing ftate at night, than 

 other trees, which abound more with watry 

 nourifhment ; and it will therefore confe- 

 quently imbibe more from the air. And 

 likely this may be the reafon, why plants in 

 hoc countries abound more with fine aro- 

 matick principles, than the more northern 

 plants; for they do undoubtedly imbibe more 

 dew. 



And if this conjecture be right, then it 

 gives us a farther reafon, why trees which 

 abound with moifture, cither from too 

 (haded a pofuion, or a too luxurious ftatc, 

 are unfruitful, viz. becaufe, being in thefe 

 cafes more replete with moifture, they can- 

 not imbibe fo ftrongly from the air, as 



Y 4 O&ers 



