GENERAL CONCLUSIONS. 55 



subject from an acquaintance with the vegetable remains preserved in 

 abundance in the Pliocene and post-Pliocene deposits of the Mississippi and 

 the lower Ohio River. An immense amount of material is there buried, 

 awaiting future investigations. This will prove even more important to 

 botanists and paleontologists than those plants which I luive had the op- 

 portunity of describing in this memoir. 



