Vlll CONTENTS. 



By Lewis D. Von Schweinitz. 

 Remarks on the Plants of Europe wliich have become naiuraUzed 



in the United States 148 



By Thomas Thomson, {of Glasgow.) 

 CnEMicAL Examination of some Minerals, chiefly from Ame- 

 rica. — With Notes by John Torrey - . - - 9 



By John Torrey. 

 Monograph of North American Cyperace^ - - 239 



By G. Troost. 



On a new genus of Serpents, and two new species of Hetero- 



DON inhabiting Tennessee ------ 174 



