6 



of only one, the doctrine of inflamma- 

 tion ; and I would not have done that, had 

 it not been perfectly analogous to the sub- 

 ject I am about to treat of*, and to show 



* Inflammation in the animal body may be defined, an 

 unequal distribution of the blood. 



Canker in fruit trees may be defined, an unequal 

 distribution of the sap ; but to follow out the analogy 

 would carry us too far from the subject immediately in 

 view. This, however, may perhaps be the subject of 

 future discussion: but every body knows, that there 

 are two ways of making a vessel carry easy, by lessen- 

 ing the contents, and by enlarging the capacity of the 

 vessel. 



The first (blood letting) is used as the only one ap- 

 plicable with success, on the animal body ; the other 

 (removing the outer bark) on- fruit trees; and both 



