2oo *The Principles of Part V. 



the higher value of the latter. Animals 

 have a fentient power within, which, irri- 

 tated by the caufe of a difeafe, quickens the 

 motions of the heart and arteries, and con- 

 tinues thefe mechanical agents till the mor-* 

 bific particles are expelled, or the animal 

 fyftem overpowered by them. But there 

 is no fuch power inherent in vegetables. 

 Unlefs a remedy is applied from without, 

 they muft continue to labour under the 

 difeafe. Whoever removes the difeafe of an 

 animal, does it by directing thefe natural 

 and mechanical motions aright, and in the 

 way that the motive power feems to point 

 out. But whoever removes a vegetable 

 difeafe, muft look on the work as entirely 

 his own, as he has got no affiftance from 

 $he vegetable itfelf. 



E c T; 



