4^0 Plan of Inquiry. [Book X. 



combined with fome other idea; hatred 'the idea of pain, 

 combined in the fame manner. Defire and averfion 

 aje active love and hatred *. 



The third part, which extends from the thirteenth 

 chapterto the conclufion of the work, will confift of 

 the application of thefe principles to the inveftigation 

 of fome curious fubjefts, and to the theory of morals. 

 This, as it is the moft extenfive part of the fubjecl, is 

 neceffarily the moft imperfect, and the chapters that 

 conftitute this part, are rather exhibited as confirmations 



of the preceding principles, than as a complete fyftem. 



/ 



* The natural appstites of man arr, 



I. The common call of nourijbment for the body. zd. The de- 

 fire of propagating the fpecies. 



The natural pleafures of man are, 



ift. The fatisfyingof thefe appetites. 2d. The general plea - 

 fure refulting from the moderate and proper exercife of the organs 

 6r faculties. 



