CONTENTS OF VOLUME XLVIII. 



NUMBER I. 



Page. 



Art. L Some Observations upon the Valley of the Jordan and the 



Dead Sea ; by John D. Sherwood, A. B., - - 1 



II. On the Crystals whi<?h occur spontaneously formed in the 



tissues of Plants ; by Prof. J. W. Bailey, — (with a plate,) 17 



III. Magnetical Investigations ; by the Rev. William Scores- 



BY, B. D., 33 



IV. A new way of obtaining the Exponential and Logarith- 



mic Theorems ; by Prof. Theodore Strong, - - 36 



V. Analysis of Coprolites from the New Red Sandstone for- 

 mation of New England ; by Samuel L. Dana, M. D. — 

 with remarks by Prof. PIitchcock, ... - 46 



VI. Extract of a Letter from Prof. E. Hitchcock, embracing 



miscellaneous Remarks upon Fossil Footmarks, the Lin- 



colnite, &c., and a Letter from Professor Richard Owen, 



on the great Birds' Nests of New Holland, - - 61 



VII. On Pseudomorphous Minerals, [Die Pseudomorphosen des 



Mineralreichs ;] by Dr. J. Reinhard Blubi, • • 66 

 VIII. Observations on Pseudomorphism ; by James D. Dana, 81 



IX. Scraps in Natural History, (Molluscs ;) by Dr. John T. 



Plummer, ........ 93 



X. (1.) Action of Solutions of the Neutral Phosphates of the 

 Alkalies upon the Carbonate of Lime, and some other 

 insoluble Carbonates; (2.) Source of Fluorine in Fossil 

 Bones; (3.) Composition of the Marl from Ashley Riv- 

 er, S. C. ; (4.) Existence of the Oxide of Cobalt in 

 South Carolina ; by J. Lawrence Smith, M. D., - 97 



XL Notice of the Medals of Creation, or First Lessons in Ge- 

 ology, and in the Study of Organic Remains ; by Gideon 

 Algernon Mantell, LL. D., F. R. S., - - - 105 



XII. New Experiments on the Solar Spectrum ; communicated 



by Prof. Olmsted, 137 



