T O 



Sir JOHN PRINGLE, Bart. 



Phyfician to his Britannic Majeily, 

 late Preiident of the Royal So- 

 ciety, Member of the Royal Aca- 

 demy of Paris, 8cc. &fc. 



SIR, 



j\ GRATEFUL remembrance of 

 - "rr pari: fervices is as juft a tri- 

 bute due to thofe from whom they 

 are received as the acquitting of a 

 debt contracted in any other manner. 

 If it is not in the power of a man 

 to make a return fuitable to the be- 

 nefits received, he is, however, in 

 a a duty 



