Vi CONTENTS. 



Page. 



XL Notice of some New Localities of Infusoria, Fossil and 



Recent ; by Prof J. W. Bailey, — (with a plate,) - 321 

 XII. Description of Fossil Footmarks, found in the Carbonife- 

 rous Series in Westmoreland County, Pennsylvania ; by 

 Alfred T. King, M. D., 343 



XIII. Idea of an Atom, suggested by the phenomena of weight 



and temperature ; by James D. Whelpley, - - 352 



XIV. On the hypothesis of Mr. Prout, with regard to Atomic 



Weights ; — in a letter from Beezelius, ... 369 

 XV. On the Drift Ice and Currents of the North Atlantic, with 

 a Chart showing the Observed Positions of the Ice at va- 

 rious times ; by W. C. Redfield, .... 373 

 XVI. Notice of a mass of Meteoric Iron found at Cambria, near 



Lockport, in the State of New York ; by B. Silliman, Jr. 388 

 XVII. Bibliographical Notices : — Report of the Commissioner of 

 Patents for 1844, 392. — Dr. Jackson's Final Report on 

 the Geology and Mineralogy of the State of New Hamp- 

 shire, with Contributions towards the Improvement of 

 Agriculture and Metallurgy, 393. — The Taconic System, 

 based on Observations in New York, Massachusetts, 

 Maine, Vermont, and Rhode Island, by Prof. Ebenezer 

 Emmons, M. D. : American Quarterly Journal of Agri- 

 culture and Science : Prof, Johnson's Report on Ameri- 

 can Coals to the Navy^^Department of the United States, 

 394. — Vestiges of the Natural History of Creation, 395. 

 Miscellanies. — Remarks on Uranium and Pyrochlore, in reply to 

 Prof. Shepard, by J. E. Teschemacher, 395. — Note on Pseu- 

 domorphism, by James D. Dana, 397. — Gold of North Caro- 

 lina, 398. — Geological observations on the region near Cen- 

 terville, Alabama, 399. — An Intermittent Spring : New Med- 

 als, Pelopium and Niobium, 400. — New Metal Ruthenium : 

 Musical Tones produced by Magnets, 401. — Atomic Weights 

 of Copper, Mercury, and Sulphur: De Vico's Comet : South- 

 ern Comet of December, 1844, 402. — D' Arrest's Comet : 

 School for the study of Elementary and Analytical Chemis- 

 try, 403. — Geological Survey of Canada : Geological Sur- 

 vey of Vermont : Lyceum of Natural History in New York : 

 Association of American Geologists and Naturalists, 404. 



