CONTENTS. 



Page 



No. 1. — Notes on the Geology of the Iron and Copper Districts of Lake Supe- 

 rior. By M. E. "Wads WORTH. (6 Plates) 1 



No. 2. — The Felsites and their Associated Rocks, North of Boston. By J. S. 

 DiLLER 165 



No. 3. — On an Occurrence of Gold in Maine. By M. E. Wadsworth . . 181 



No. 4. — A Microscopical Study of the Iron Ore, or Peridotite of Iron-Mine 

 Hill, Cumberland, Rhode Island. By M. E. Wajjsworth .... 183 



No. 5. — Observations upon the Physical Geography and Geology of Mount 

 Ktaadn. By C. E. Hamlin. (2 Plates) 189 



No. G. — Report on the Recent Additions of Fossil Plants to the Museum Col- 

 lections. By Leo Lesquereux 225 



No. 7. — The Great Dike at Hough's Neck, Quincy, Mass. By Joiix Eliot 

 Wolff 231 



No. 8. — On some Specimens of Permian Fossil Plants from Colorado. By 

 Leo Lesquereux 243 



No. 9. — On the Relations of the Triassic Traps and Sandstones of the Eastern 

 United States. By "William Morris Davis. (3 Plates) . . . .249 



No. 10. — The Folded Helderberg Limestones, East of the Catskills. By 

 "William Morris Davis. (2 Plates) 811 



No. 11. — The Azoic System and its Proposed Subdivisions. By J. D, 

 "Whitnet and M. E. "Wadsworth 331 



