12 PREFACE. 



writer not to state the obligation he is under to Mr. 

 George Chilton^ of this city, for the many pure and 

 delicate tests with which he furnished him, and by which 

 he was materially aided. In the third division of 

 the subject, the application of the Eupatorium Perfoli- 

 atum as an article of the materia medica is considered* 

 Its utility in this respect, it is hoped, Jias not been ex- 

 aggerated, as nothing has been asserted that experiment 

 did not seem to warrant ; and beside, the opportunities 

 which the writer enjoyed of witnessing its effects in the 

 treatment of various diseases, during his attendance at 

 the Alms-house of this city, fully confirm, in his opi- 

 nion, all that has been said of its medical virtues. 



New- York, May 3, 1813. 



