VI PREFACE. 



? 



much instruction when his attention was first 

 directed to Botanical pursuits. 



To Dr. Lewis de Schweinitz he is indebted 

 for notes on many genera and species of our 

 plants, for a long and friendly correspondence 

 and for many specimens of plants from North- 

 Carolina. 



To Zaccheus Collins, Esq. of PhiladelphifC, 

 he wishes tojeturn his thanks for repeated acts 

 of kindness, for many and very beautiful spe- . 

 ciniens of Northern plants which served him as 

 standards of comparison, for some rare and in- 

 teresting minerals, and for much information on 

 subjects connected with his researches. 



To Dr. John Torrey of New- York, he is in- 

 debted for many of the plants of New-Jersey 

 and New-York, for an opportunity oif compar- 



ig many doubtful species, and of 



taining 



many of the plants of Pursh which were to him 



uncertam or obscure 



? 



To Mr. Rafinesque of Lexington, Kentucky, 

 he IS under, obligations for many plants of the 

 Western States, and for the pleasure of 

 teresting correspondence. 



To Dr. Bigelow and Mr. P. Boott of Boston 



an in 



he wishes also to express his obligations for 

 inany very beautiful specimens of plants from 



the Eastern States. 



To Mr. Nuttall he is also indebted for some 

 rare plants from the Arkansaw and Missouri. 



To those who have aided him i„ collecting 

 the plants from which this sketch has been com* 



