[ .7 5 3 

 ftate hurtful to them, but rendered 

 ufeful to the animals, who in their 

 tour take from this air, by the adt. 

 of refpiration, what they want, and 

 throw out the remainder as hurtful 

 to them ; but rendered again 

 ferviceable to the vegetables. This 

 theory feems to be very reafonable, 

 and to have fome foundation in na- 

 ture. It throws a good deal of light 

 upon the osconomy of nature, and 

 the mutual influence which the ve- 

 getable kingdom has upon the ani- 

 mal, and the animal upon the ve- 

 getable. It has fome analogy with, 

 other general operations of nature^ 

 which are well known. 



A plant, which is a living being? 

 deftitute of motion, remaining upon 

 the fame fpot on which It took its 

 beginning, if not capable, as animals 

 are, of going in fearch of its food ? 



muft 



