1879.] 183 



A letter from the Corresponding Secretary of the Ken- 

 tucky Historical Society, dated Lexington, Ky., January 20, 

 1879, was read, and, on motion, the name of that Society 

 was placed on the list of correspondents to receive the Pro- 

 ceedings, from the beginning of the current volume. 



A letter respecting exchanges was received from the 

 Michigan Library Association at Cold water, Mich., dated 

 January 20, 1879. 



An obituary notice of the late Robert Frazer, was read by 

 Professor Frazer. 



The death of Dr. John B. Biddle at Philadelphia, January 

 19, 1879, aged 66 years, was announced, and on motion Dr. 

 Henry C. Chapman was appointed to prepare an obituary 

 notice of the deceased. 



The death of Judge John Cadwalader, at Philadelphia, 

 January 26, 1879, aged 73 years, was announced by Mr. 

 Fraley, and on motion Mr. McCall was appointed to prepare 

 an obituary notice of the deceased. 



A communication, entitled " Preliminary notice of an in- 

 vestigation on Petrocene, a product of the destructive distilla- 

 tion of Petroleum, by Samuel P. Sadtler and H. G. McCarter," 

 was read by the Secretary. 



A communication respecting some remarkable conjunc- 

 tions of semi-anthracite and semi-bituminous coal beds in 

 Sullivan county, and certain hygrometric cokes, by Franklin 

 Piatt, Assistant on the Geological Survey of Pennsylvania, 

 was read by the Secretary. 



A communication, entitled " Some notes upon the collec- 

 tion of coins and medals, now on exhibition at the Pennsyl- 

 vania Museum and School of Industrial Art, in Memorial 

 Hall, Fairinount Park, Philadelphia, by Henry riiillips, Jr., 

 A. M.," was read by the Secretary. 



An essay on the Philosophy of Christianity was read by 

 Prof. P. E. Chase, pursuant to notice given on the card (see 

 page 123 above). 



A new combination of Peaucellier cells intended for draw- 

 ing arcs of large circles and straight lines, by students of the 

 University, was exhibited and explained by Prof. Marks. 



