CONTENTS OF VOLUME XXVIl. 



NUMBER I. 



Page. 



Art. I. Report on a projected Geological and Topographical 

 Survey of the State of Maryland, by Prof. Julius T. 

 DucAT£L, M. D. and John H. Alexander, Esq. 1 



II. Experimental Enquiry into some of the Laws of the Ele- 

 mentary Voltaic Battery ; by Prof. William B. Ro- 

 gers, and Henry D. Rogers, F. G. S. - - 39 



III. Some Encomiums upon the excellent Treatise of Chem- 



istry, by Berzelius ; also. Objections to his Nomencla- 

 ture, and Suggestions respecting a Substitute, deemed 

 preferable; by Prof. Robert Hare, M. D. - 61 



IV. Miscellaneous Communications from an American Naval 



Officer, travelling in Europe ; forwarded from the Medi- 

 terranean, May, 1834, - - - - 74 

 V. On the apparent anomaly observed in the rotation of li- 

 quids of different specific gravities when placed upon 

 each other ; by Prof. Walter R. Johnson, - 84 

 VI. Theory of the Bellows ; by H. Strait, - - 88 

 VII. Application of the Principle of a Balance; by H. Strait, 92 

 VIII. Improvement of the Barometer ; by Chas. F. Durant, 97 

 IX. Junction of Trap and Sandstone, Wallingford, Conn.; by 



A. B. Chapin, Esq. - - - - 104 

 X. Observations on the disturbance in the direction of the 

 Horizontal Needle — 1. During the Aurora Borealis visi- 

 ble at Philadelphia, on the 17th of May, 1833 ; 2. Dur- 

 ing that of July 10, 1833 ; by Prof. A. D. Bache, 113 

 XI. Problems ; by D. C. Lapham, Civil Engineer, - • 127 

 XII. Remarks on Professor Mitchell's method of preparing 

 Carbonic Oxide, free from carbonic acid ; by Prof. L. 

 D. Gale, M.D. 129 



XIII. Rail Road Curves; by Thos. Gorton, Civil Engineer, 131 



XIV. Apparatus for freezing Water by the aid of Sulphuric 



Acid ; by Prof. R. Hare, M. D. - - - 132 



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