Preliminary Observations. XV 
As it is probable that country practitioners of medicine residing 
in different parts of the United States, are possessed of much useful 
information, derived from experience, concerning our native medi- 
cines, the author earnestly solicits communications on this subject. 
Due credit will always be given for any facts on good authority, com- 
municated in this manner. . 
The Trustees of the University of Pennsylvania having recently 
purchased forty-two acres of rich and watered land, near to Philadel- 
phia, for the establishment of a Botanic Garden: physicians residing 
in the different parts of our country, who have it in their power, will 
contribute materially to this institution, by transmitting to the author, 
seeds or roots of such _— as they have found possessed of actin 
meitieigel virtues. i 
Philadelphia, July 4, 1847% © * 3 “fs 
