LIBRARY 

 NEW YORK 

 BOTANICAL 



GARDEN 



PREFACE. 



A number of fossil vegetable impressions, — from the 

 Apalachian coal-field, — upon which the accompanying 

 series of investigations was made, formed a part of a 

 collection of Professor Ferdinand Romer, which, after 

 his return from a scientific tour in North America, he 

 deposited in the paleontological cabinet of the Berlin 

 University. 



Unfortunately, the notes pertaining to the immediate 

 localities of these fossil impressions, are no longer to be 

 found; but, with the exception of three species of Lepi- 

 dodendra from the Ohio coal-field, it is certain that they 

 are from the state of Pennsylvania. The matrix of the 

 Ohio specimens is argillaceous sandstone, while that of 

 the Pennsylvania fossils is of hard, bluish black, ar- 

 gillaceous slate. 



