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CONTENTS OF VOLUME XXVI. 



NUMBER I. 



Art. I. Ascent of Mount Etna, February, 1832; by Sidney 



L. Johnson, of the U. States squadron in the Medi- 



Page. 



terranean, 



1 



II. Considerations upon the temperature of the terrestrial 



Globe ; by M. Parrot, of St. Petersburg, - 10 



III. An Enquiry into the Cause of the Voltaic Currents 



produced by the action of magnets and electro- 

 dynamic cylinders upon coils and revolving plates ; 

 by Prof. John P. Emmet, M. D. - - 23 



IV. Motion of a system of Bodies ; by Prof. Theodore 



Strong, - - - - 44 



V. On the Navigation of Cape Horn ; by M. F. Maury, 



Passed Midshipman U. S. Navy, - 54 



VI. Plan of an instrument for finding the true Lunar Dis- 

 tance; invented by M. F. Maury, Passed Midship- 

 man U. S. Navy, - - - - - 63 



VII. On the color of the air and of deep waters, and on 



some other analogous fugitive colors; by Count 

 Xavier De Maistre, 65 



VIII. The voice and its modifications, (more particularly 



Ventriloquism,) briefly considered ; by Robert 

 Tolefree, jr. - - - 76 



IX. Meteorological Journal, kept at Marietta, Ohio, for 



the year 1833 ; by S. P. IIildreth, - - 84 



X. Abstract of Meteorological Observations, made at 

 Matanzas, (Cuba,) lat. 23° 2' N., Ion. 81° 36' W., 

 from Aug. 1, 1832, to July 31, 1833; by A. Mallory, 89 



XL Physical Discovery — (Retrospective.) — The Magnetic 



Needle made to indicate the true north, and rendered 

 more steady, by a newly invented magnetic process, 90 

 XII. On the Prairies of Alabama ; by W. W. McGuire, 93 



XIII. Circulation in Vegetables ; by Prof. E. Emmons, 99 



XIV. Notice of a Galvanometer; by Dr. John Locke, 103 

 XV. A Parasite Tree ; by Geo. W. Long, Lieut. 4th Regt. 



U. S. Artillery, 



106 



XVI. Cartography ; by Prof. C. Dewey, - - 107 



