PROCEEDINGS 
OF THE 
ACADEMY OF NATURAL SCIENCES 
OF PHILADELPHIA. 
January 6th, 1852. 
The President, Mr. Groner Orb, 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 Hsq., 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. Ist, 1852, presenting 
his acknowledgments for his election as President of the Institution. 
_. Dr. Leidy read a continuation of Mr. Dana’s paper on the Crustacea 
of the late U. 8. 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 : | 
6 One occurrence always excited much interest, whenever there was an evolu- 
tion of sulpho-hydric acid gas (a frequent occurrence) from the bottom ot the 
- Bay of Callao. The first premonition of what was to produce a remarkable 
PROCEED. ACAD. NAT. SCIo OF PHILADELPHIA.—VOL- VI. NO. I. 1 
