Xiv CONTENTS. 



No. V. 



Tables of Observations on the Winds, the Currents, the Gulph Stream, 

 the Comparative Temperature of the Air and Water, &c. made on 

 the North Atlantic Ocean, during Twenty -six Voyages to and from 

 Europe, (principally between Philadelphia and Liverpool,) between 

 the years 1799 and I8ir, inclusive. By John Hamilton. - - 140 



No. VI. 



Observations on the Trap Rocks of the Connewago Hills near Middle- 

 town, Dauphin County, and of the Stony Ridge near Carlisle, Cum- 

 berland County, Pennsylvania. By the Honorable John B. Gibson. 156 



No. VII. 



\n Account of two North American Species of Cyperus, discovered 

 in the State of Georgia: and of four Species of Kyllingia, found 

 on the Biazilian coast, and on the Rio de la Plata in South America. 

 By William Baldwin, M.D. - - - l^r 



No. VIII. 



Catalogue of Plants collected during a Journey to and from the 

 Rocky Mountains, during the summer of 1820. By E. P. James, 

 attached to the Exploring Expedition commanded by Major S. H. 

 Long, of the United States Engineers ; by whom it was commu- 

 nicated to the Society, with the permission of the Hon. J. C. Cal- 

 houn, Secretary of War. - - - - - -172 



No. IX. 



Remarks on the Sandstone and Floetz Trap Formations of the West- 

 ern Part of the Valley of the Mississippi. By E. P. James, attached 

 to the Exploring Expedition commanded by Major S. H. Long, of 

 the United States Engineers ; by whom it was communicated to 

 the Society, with the permission of the Hon. J. C. Calhoun, Secre- 

 tary of War. ------- *9^ 



No. X. 



Some Observations on the Anatomy and Physiology of the Alligator 

 of North America. Lacertii Alfigator, Gmel. Crocoddus Lucius, 

 Cuvicr. Communicated to the American Philosophical Society by 

 N. M. Hentz, Member of the Academy of Natural Sciences of Phi- 

 ladelphia -------'-* 



