VI 



CONTENTS. 



VII. 



r ariation of the Magnetic Needle at Providence, R. I., 

 from A. D. 1717 to 1843; by M. B. Lockwood, Civil 

 Engineer, ..--.-..- 



Page, 



VIII. 



w 



314 

 - 315 



IX. Notice of the discovery of a New Locality of the " Infu- 



sorial Stratum ;" by M. Tuomey, 



- 339 



X. Letter from Richard Owen, Esq., F. R. S., F. G. S., &c. 

 &c, on Dr. Harlan's Notice of New Fossil Mammalia 



published in this Journal, Vol. xliii, p. 141, 



- 341 



XL Notice of a new Trilobite, Ceraurus crosotus ; by Prof. 



John Locke, M. D., 



C. B. Hayden, 



■ 



XVIII. Notice of the Discovery of a nearly complete Skeleton of 



the Zygodon of Owen (Basilosaurus of Harlan) in Ala- 



bama; by S. B. Buckley, A. M., 

 XIX. Notice of the Great Comet of 1343, 



Miscellanies. — Fossil Birds, 417. — Passage of two or more Elec- 

 trical Currents over the same Conductor without interference : 

 Account of an exhibition of Shooting Stars, seen in the day 

 time, 418. — Earthquakes in the United States : Great Earth- 



West 



419. 



Reports 



North America : Thracia inequalis, 420. 



346 



XII. Abstract of a Meteorological Journal, for the year 1842, 



kept at Marietta, Ohio; by S. P. Hildreth, M. D., - 347 

 XIII. Abstract of the Proceedings of the Twelfth Meeting of the 



British Association for the Advancement of Science, - 351 



XIV. Astronomy and Photography at Rome ; by J. Taylor, Esq., 373 

 XV. Notice of Dr. Hare's u Strictures on Prof. Dove's Essay on 



the Law of Storms;" by W. C. Redfield, - - 384 



XVI. United States Exploring Expedition, - 393 



XVII. Analysis of the Scott Spring, Scott County, Virginia; by 



409 



- 409 



- 412 





