CONTENTS. V 



Page. 



in. Address delivered at the Meeting of the Association of 

 American Geologists and Naturalists, held in Washington, 

 May, 1844 ; by Prof. Henry D. Rogers, — (concluded,) 247 



IV. Comparison of Gauss's Theory of Terrestrial Magnetism 



with observation ; by Prof. Elias Loomis, - - 278 

 V. Selections from an Ancient Catalogue of objects of Nat- 

 ural History, formed in New England more than one 

 hundred years ago ; by John Winthrop, F. R. S., 282 



VI. Abstract of a Meteorological Register for 1832-43, kept 



at Rio de Janeiro ; by John Gardner, Esq., - 290 

 VII. Report on Ichnolithology, or Fossil Footmarks, with a De- 

 scription of several New Species, and the Coprolites of 

 Birds, from the valley of Connecticut River, and of a 

 supposed Footmark from the valley of Hudson River ; 

 by Prof. Edward Hitchcock, LL. D. — (with two plates,) 292 

 VIII. Discovery of more Native Copper in the town of Whately 

 in Massachusetts, in the valley of Connecticut River, 

 with remarks upon its Origin ; by Prof. Edward Hitch- 

 cock, LL. D., 322 



IX. Secular Acceleration of the Moon's Mean Motion ; by 



James H. Coffin, 324 



X. Review of Alger's Phillips' Mineralogy, and Shepard's 



Treatise on Mineralogy, - - - - - 333 



XL Discovery of the Yttro-Cerite in Massachusetts ; by Prof. 



Edward Hitchcock, LL. D., .... 351 



XII. Review of the New York Geological Reports, - 354 



XIII. On the Measure of Polygons ; by Prof. George C. Whit- 



lock, ........ 380 



XIV. On the Discovery of Fossil Footmarks ; by James Deane, 



M. D., 381 



XV. Rejoinder to the preceding Article of Dr. Deane ; by Prof. 



Edward Hitchcock, 390 



XVI. Answer to the " Rejoinder" of Prof. Hitchcock ; by James 



Deane, M. D,, 399 



XVII. On the Unionidse of the River of the Country of the 



Iguanodon ; by Gideon Algernon Mantell, M. D., 



F. R. S., &c., 402 



XVIII. On a supposed New Species of Hippopotamus ; by S. G. 



Morton, M. D., 406 



