INTllODUCTIOX. IX 



portant facts or valuable communications, for 

 which he feels happy to tender this public tes- 

 timony of gratitude. 



94. They are Dr. JVtease, and Z. Collins of 

 Philadelphia. 



Drs. Short and Brown of Lexington. 



Dr. Eoff of Wheeling. 



Dr. Muller of New Harmony. 



Dr. Drake of Cincinnati. 



Dr. Crockett of Frankfort. 



Dr. Graham of Harrodsburg. 



Dr. Mac Williams of Washington City. 



Dr. Hales of Troy. 



Dr. Lawrence of New Lebanon. 



Drs. L. Beck and Tully of Albany. 



Drs. Mitchell and T'orrey of New York. 



53. It has been ascertained that there are 



nearly six hundred medical plants actually 



known and nsed as such l^ the United States: 



many of which are merelj" medical equivalents. 



56. This number being too great for the pur- 

 pose of a manual, one liuudred and five of the 

 most active and efficient medical Types have 



iired and described. 



57. Tlie others have been referred to these 

 as substitutes or succedanea, when they possess 

 nearly the same ostensible qualities and pro- 

 perties. In fact they are mostly used for each 

 other throughout the country. 



58. Those selected include all the species of 

 Bigelow and W. Barton, with twenty-five addi- 

 tional species. It had been advised to reduc 



the whole number to fifty active plants; but 



reduction would have left out many 



