'^^^'^' p^R OCEE DINGS 



^ OF THE 



AMERICAN PHILOSOPHICAL SOCIETY, 



HELD AT PHILADELPHIA, FOR PROMOTING USEFUL KNOWLEDGE. 



VoT,. XIX. January to June, ISSl/"- No. 108. 



TABLE OF CONTENTe_ 



PAGE. 



Stated Meeting, January 7 211 



Obituary notice of Peter McCall. By Henry Phillips, Jr 21^ 



Note on the protection of Oil Tanlis from lightning stroke. Bj- B. 



Howard Rand, M. D 21G 



Stated Meeting, January 21 217 



Election of 8 new members 218 



A geological reconnoissance of parts of Lee, Wise, Scott, and 

 Washington counties, Va. By J. J. Stevenson. ( With a colored 



map. ) 219 



Photodynamic notes. By P. E. Chase : — 1. Chemical sj'nchronism. 

 '2. Magnetism. 3. Earth's orbital eccentricity. 4. Cosmical and 

 molecular densities and velocities. 5. Estimate of Earth's mass. 

 7. Jupiter's day. 8. Moon's mass. 9. Earth's semi-axis major. 

 10. The photodynamic year. 11. Masses of Jupiter and Saturn. 

 12. Centre of planetarj^ inertia. 13. Earth's rupturing or projectile 



locus. 14. Callisto. 15. Probable values 262 



Stated Meeting, February 4 274 



The Upper Freeport coal bed in Preston county, W. Ya. Bj' J. J. 



Stevenson 276 



Memoir of S. S. Haldeman. By D. G. Brinton, M. D 279 



Stated Meeting, February 18 285 



Report of Committee on the Michaux legacy 286 



On a cours de botanique fossile by Prof M. B. Renault. By Leo 



Lesguereux 287 



Certain almanacs published in Philadelphia between 1705 and 1744. 



By Henry Phillips, Jr 291 



Stated Meeting, March 4= 298 



Stated Meeting, March 18 299 



Discovery of the preglacial outlet of the basin of Lake Erie into 

 that of Lake Ontario and notes on the origin of our lower great 



lakes. By /. W. Spencer. ( With two maps.) 300 



Geological section at St. Mary's, Elk County, Pa. By C. A. Ash- 

 burner 337 



Stated Meeting, April 1 348 



Fontaine's Rhaetic flora 349 



Saltville fault explained by W. M. Fontaine. 349 



