PREFACE. 



who have generoufly promoted this pub- 

 lication j as without this public manner 

 cf acknowledging their favours, I would 

 think myfelf guilty of ingratitude, which, 

 in my opinion, is one of the moft de- 

 teftable vices. 



London, 

 Felr. the i$tb 9 1771. 



PETER 



