PREFACE TO THE FIRST EDITION. 



The Subscriber takes this mode of expressing his thanks 

 to Mr. Wm. M. Canby of Wilmington, Delaware, for much 

 assistance in the compilation of the Catalogue of Flowering 

 Plants, and to Professor D. C. Eaton of New Haven, Connect- 

 icut, for the Catalogue of the Vascular Cryptogamia, the most 

 comijlete one, it is believed, yet published. For all imper- 

 fections, which are Qumerous enough, as the list of Errata 

 (to which all are especially directed) partially shows, he must 

 4old himself alone responsible. It is requested that other 

 errors which may be detected by those who use the Catalogue, 

 may be communicated, in view of another possible edition., 



HORACE MANN. 

 Cambridge, July 1, 1868. 



