Setf. II. Agriculture and Vegetation. 129 



OTHERS, feeing the neceffity of the air 

 to all plants, and obferving that plants im- 

 bibe a great deal during the night, as Dr. 

 Hales 's experiments fufficiently mow, affert, 

 that the foil only gives them fupport, but 

 air nourimment. To this the anfwer is 

 fhort, That plants thriving better in fome 

 foils than in others, and in proportion as 

 thefe foils are manured, fhows the ground 

 to be the principal pafture of plants ; the 

 air being the fame in grounds adjoining to 

 one another. 



THE author of the Hijlolre Phyfique de- 

 duces all plants from certain fimilar orga- 

 nifed parts, which he fuppofes flying up and 

 down the air in great plenty, and which 

 attach themfelves, in fome unknown way, 

 each to its own tribe. If this were the 

 cafe, dung made of plants of the fame 

 fpecies, would fucceed beftj which is net 

 fo. I lhall allow this unphilofophical opi- 



K nion 



