PROCEEDINGS 



OP THE 



ACADEMYOF NATURAL SCIENCES 



OF PHILADELPHIA. 



January Qthf 1852. 

 The President, Mr. George Ord, in the Chair. 



Letters were read : 



^ From Dr. Benjamin F. Shumard, dated Oregon City, Nov. 18th, 1851, 

 giving a brief account of his geological observations in Oregon Territory. 



From the Secretary of the American Philosophical Society, dated 

 Philadelphia, Dec. 19th, 1851, acknowledging the receipt of various Nos. 

 of Vols. 4 and 5 of the Proceedings, furnished by request to complete the 

 series of the same in the Library of that Society. 



From the Secretary of the Trustees of the New York State Library, 

 dated Albany, Dec. 26th, 1851, acknowledging the receipt of late Nos. 

 of the Proceedings, &c. 



From T. R. Peale Esq., dated Washington, D. C, Dec. 26th, 1851, 

 suggesting the propriety of taking measures at this time to dispose of the 

 collection of French Political Documents belonging to the Academy, to 

 Congress. 



From George Ord, Esq., dated Philadelphia, Jan. 1st, 1852, presenting 

 his acknowledgments for his election as President of the Institution. 

 I Dr. Leidy read a continuation of Mr. Dana's paper on the Crustacea 

 of the late U. S. Exploring Expedition, which was on motion referred to 

 the Committee on the former portions of the paper. 



Dr. Leconte read a paper entitled '* Notice of fossil Dicotyles from 

 Missouri," and also a *' Notice of some fossil Pachyderms from Illinois; 

 both of which being intended for publication in the Proceedings, were 

 referred to Dr. Leidy, Dr. Carson and Mr. Moss. 



Dr. Leidy read the following remarks by Dr. J. L. Burtt, U. S. N., 

 on the influence of Sulphuretted Hydrogen arising from the bottom of 

 the Bay of Callao on the fishes in its waters : 



'* One occurrence always excited much interest, whenever there was an evolu- 

 tion of sulpho-hydric acid gas (a frequent occurrence) from the bottom ol the 

 Bay of Callao. The first premonition of what was to produce a remarkable 



raOCEED. ACAD. NAT. SCI. Or PHILADELPHIA. VOL. VI. NO. I. 1 



