TO 



JOHN W. FRANCIS, M. D. 



Lecturer on the Institutes of Medicine andthe Materia Medica 

 in the College of Physicians and Siirgeons in the Univer' 

 sity of New-York, Member of the Society for the Promo- 

 tion of Useful Arts in the State if New-York^ &c. 



Sir, 



I HAVE prefixed your name to this dedication, be- 

 cause, by your assistance, I have been materially aided 

 in the course of my medical studies. It would be im- 

 proper here to mention the many acts of friendship I 

 have experienced at your hands ; but be assured they 

 have caused the deepest impression on my mind, and 

 that the recollection of them will not readily. 'ie ob- 

 literated. 



THE AUTHOR. 



