CONTENTS OF VOLUME XXIII. 



NUMBER I. 



Page. 

 Art. I. Geological and Mineralogical Account of the MiningDis- 

 • tricts in the State of Georgia — western part of North 



Carolina and of East Tennessee, with a map ; by Hon. 

 Judge Jacob Peck, ______ i 



II. On the temperature and Saltness of the Waters of the 



Ocean at different depths, _ - - - _ lo 



III. Note on the Progressive Increase of Temperature be- 



neath the surface of the Earth, _ _ _ _ 14 



IV. Universal Terms — Disputes concerning them and their 



Causes; by Emma Willard, - - - - - 18 



V. On the action of the second surfaces of transparent plates 



upon light ; by David Brewster, LL. D. F. R. S. - 28 



VI. On Hail Storms ; by A. Jones, M. D., of Augusta, 



Georgia, -_--____ 35 



VII. Improvement in Field Surveying, - - - - 37 



VIII. On the Origin, Extension and Continuance of Prairies ; 



by Dr. Rush Nutt, of Rodney, State of Mississippi, 40 



IX. Observations on depriving Flowers of their Anthers, to 



produce Double Flowers ; by E. T. Leitner, - 45 



X. Miscellaneous Geological Topics relating to the lower 

 part of the vale of the Mississippi ; by Dr. Rush Nutt, 

 of Rodney, Mississippi, - _ _ . _ 49 



XI. Notice of an Ancient American Utensil ; by Prof. Walter 



R. Johnson, _.____. 65 



XII. Remarks on the Strength of Cylindrical Steam Boilers ; 



by Prof. Walter R. Johnson, - - - - 68 



XIII. A simplification of Dr. Wollaston's Reflective Goniome- 



ter; by R. Graves, Jr. Civil Engineer, - - 75 



XIV. List of the Plants of Chile; translated from the "Mer- 



curic Chileno," by W. S. W. Ruschenberger, M. D. 



U. S. Navy, - - 78 



XV. Notice of a Fountain of Petroleum, called the Oil Spring. 



— Editor, -_-_---_ 97 



XVI. Notice of Wood's Inking Machine, - - _ - 103 

 XVII, Observations on Inclined Planes ; by J. Thomson, - 107 



ffnoy 



