mat\, with whom I had previously been on terms of in- 

 timate friendship, v/as now in possession of an extreme- 

 ly valuable collection of living and dried plants, to which 

 I had unrestrained access. To his liberality I am in- 

 debted for many new and scarce specimens, which filled 

 up a desideratum in my collection, particularly in the 

 plants of Lower Louisiana and Georgia. Those species 

 exclusively received from his collection I have distin- 

 guished by " V. s. in Herb. Enslen." 



At the same time I had frequent opportunities of 

 seeing the herbarium and collection of living plants of 

 Mr. John Lyon, a gentleman through whose industry 

 and skill more new and rare American plants have lately 

 been introduced into Europe than through any other 

 channel whatever. Those plants particularly adopted 

 from his collection I have marked with " v. s. in Herb. 

 Lyon." 



By these and several other connections, which It i» 

 imnecessary to mention here, added to my own occa- 

 sional excursions through the different parts of the 

 United States, I was put in possession of an extensive 

 herbarium^ containing plants from all the different parts 

 of North America ; which when summed up would 

 nearly dou!)Ie the number of those described in Mi- 

 chaux's excellent Flora. As that work was then ex- 

 tremely scarce in America, I determined to publish a Com- 

 pendium of itj executed on the plan of Hoffmann's 

 Flora Germanica, which \^ork I had no doubt would be 

 acceptable to the botanist, and particularly so to the 

 cultivator. I communicated my design to Messrs. Brad- 

 ford and Inskeep, booksellers at Philadelphia, who gave 

 me every encouragement towards the prosecution thereof. 



