sten, llS.^Action of Light upon the lodid of Ethyl, 114: On a series of alka- 

 loids homologous with Ammoniajllo. — Constitution and products of the decom- 

 position of Codein, 116. — Acetic Acid from Sea- weeds : New test for the Ni- 

 trites and Nitrates, by George C- Sch^ffek, 117. 



Geology, — On the ParalleHsra of Mountain Chains in America, by Mr. Djesor, 118, 

 •Lower Silurian Reptile in Canada, 120. 



Zoology.-^On the Classification of the Cancroidea, by J. D. Daxa, 121. — Addi- 

 ditional note to the Remarks on the Classification oF the Maioidea, by J. D- 

 Dana, 13L — [Microscopic examination of Soundings, made by the U. S. Coast 

 Survey off the Atlantic Coast of the United States, by Prof J, W. Bailey, 132. 



4 



Astronomy, — On the new Ring of Saturn; by W- C. Bond, Esq., 133. — On the 

 Total Ellipse of the Sun/of July 28, 1851, by R. T. Paink, Esq., 134, 



Miscellaneous Intelligence, — Electro-magnetic Locomotive, 139. — Meeting of the 

 American Association for the Advancement of Science at Cincinnati, 141. 

 Gold in Arkansas t Rise and Fall of Lake Erie, 143. — Obituary. — Dr. S. G. 

 Morton, 144.-^Oersted/i47.— Jacobi, 148. 



Bibliography,— ~AsUonom\G¥i\ ObsevvaiionSf made under the direction of Lieut. 

 M- F. Maukt, U.S. N., during the year 1846, 149.— Practical Mineralogy, As- 

 saying and Mining, by Frederick Overman, Mining Engineer: A Chart giv- 

 ing an Ideal Section of the Successive Geological Formations, by James Hai.i., 



F 



150,— The Christian Retrospect and Register, a summary of the Scientific, Moral 

 and Religious Progress of the first half of the XlXth century, by Robert 

 Bairi) : Annals of the Lyceum of Natural History of New York, 151, 



m 



List of Works, 152, 



4 



'> 



r^ 



«tj 



Erratum.— P. 17, 2d line 



Addem-dcm. — Vol. XI, to 

 Ross^ Spencer and Nachet^ 2 



