G38 



Peter (86 to 92) ; and Mr. Eothermel (92) ; the Providence 

 Franklin Society (93) ; Philadelphia Numismatic Society 

 (93), and Prof. Henry (93). 



Donations for the Library were received from the Ob- 

 servatories at St. Petersburg!! and Barcelona ; the Academy 

 at Berlin ; the Met. Inst, at Vienna ; J. Korosi, of Pesth ; 

 the Society at Bremen ; Nouvelles Met. and Revue Politique 

 at Paris ; P. S. at Tasmania ; Astron. Geog. and Chem. 

 Societies at London ; Victoria Institute ; N"ature ; Essex Insti- 

 tute ; Boston S. N. H.; U. S. Postal G-uide ; Am. Journal Sci- 

 ence and Art ; Yale College ; New York Lyceum N. H.; As- 

 tor Library ; Philadelphia Academy Natural Sciences ; 

 Franklin Inst.; American Journal Medical Sciences ; News 

 and Library ; Journal of Pharmacy ; Penn Monthly ; U. S. 

 Engineer Department, and the St. Louis Western. 



The death of Sir W. E. Logan at London, June 28th, 

 1875. age 77, was announced by the Secretary. 



Dr. Cresson communicated the result of further experi- 

 ments on the influence of magnetic force on the tensile 

 strength of iron and steel. He announced the fact as new 

 that in the aerial magnet, or zone of magnetism in the empty 

 space within the coil, there is a considerable elevation of 

 temperature. 



Prof. Lesley communicated the recent discovery by Mr. 

 Ashburner, aid on the survey of the State, that the White 

 •Catskill (Vespertine Sandstone of Mr. Rogers) No. X is a 

 true coal-measure formation, 19 distinct coal beds hav- 

 ing been counted, one of which is one foot thick and ap- 

 p)ears to be persistent, for a similar bed outcrops in a gap a 

 few miles distant. These beds were cut in the tunnel of 

 the East Broad Top Railroad through Sideling Hill in Hun- 

 tingdon County, Pennsylvania. This discovery explains the 

 Peak Mountain coal-measures below the red shale in Wythe 

 County, Virginia, as well as the presence of coal-beds in the 

 Upper Devonian on the Potomac, and of coal-beds about 

 700 feet below the Millstone Grit (conglomerate No. XII) 

 in the Allegheny mountain ravines back of Tipton and Ty- 



