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XII, 
CONTENTS OF VOLUME XLIX. 
NUMBER I. 
On the Physical Geology of the United States east of the 
ocky Mountains, and on some of the Causes affecting 
the Sedimentary Formations of the Earth; 2, Prof. 
~ Witriam W. Marner, 
. Account of some new ‘Adee of Pilsophica Appar 
tus; by Prof. E.S. Swett, = - 
. Review of Dr. C. T. Jacxson’s Final Repiie on die Geol- 
ogy and Mineralogy of the State of New ae 
by Tuomas T. Bouve, - ~ 
Description of some Artificial em on Prairie j jefe, 
Louisiana; by Prof.C.G, Forsuzy, = - 
. Caricography ; by Prof. C. Dewry,—(with a a 
. Origin of the constituent and adventitious Minerals of 
Trap and the Allied Rocks; by James D. Dana, - 
Considerations respecting the Copper Mines of Lake Su- 
perior ; by Lieut. D. Ruaczes, U.S. A., : 
Singular case of Parhelion, with a statement of the Theory 
of ordinary Halos; by Prof. E. 8. Snez, - 
. Notice of a New — of Batrachian Footmarks ; y 
James Deane, M. D., 
On the Copper and Silver of Reve Pain bake Supe 
rior; by C. T. Jackson, 
Practical Observations on the Clesideaton of Statical Blee- 
tricity by the Electrical Machine ; ” Lieut. Grorce W. 
Rains, U.S. A., - 
. Ruins of Ninna Sensis of ie Tousen made 
in 1843 and 1844; by Rev. Azarianu Situ, M.D., - 
On several New Plants; by Dr. M. C. hektaaanna 
XIV. New Electro-Magnetie Engine ; by Prof. Cuas. G. Pace, 
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