593 



Societies and yournals Placed on the List of Correspondents. Page. 



Baltimore. American Journal of Mathematics 179 



Cleveland. Ohio. The American Antiquarian 87 



Baltimore. American Chemical Journal. Dr. Remsen, Editor 23(1 



Lei psig, Germany. Zoologischer Anzelger 153 



Lexington. Kentucky Historical Society 183 



Michigan State Library 351 



Modena. R. Accad. di Scienze 



New York. American Chemical Society 153 



Philadelphia. Engineers' Club 6 



Philadelphia. Journal of the Medical Sciences 353 



West Chester, Pa. Philosophical Society 87 



Committees on Papers Jor the Transactions. 



W. M. Fontaine and J. C. White. 



Upper Carboniferous Flora of West Virginia 39 



Haldeman, S. S. 



Pre-Historic Remains in the Cave near Chicques Rock, in Lancaster 

 County, Pa 7 



Communications. 

 ASHBURNER, C. A. 



Oil Well Records in McKean and Elk Counties, Pa 1,9 



On the Constitution of the Bradford Oil Sand 418, 119 



Barker, George F. 



On the Total Solar Eclipse of July 29, 1878 62, 103 



Blasius, William. 



Musical Invention of Mr. Matthews 81 



Briggs, Robert. 



Artificial Ice Machines at Paris 39, 88 



Force and Fuel Applied to Electric Lighting as Compared with Light- 

 ing by Coal Gas 39 



Perpetual Battery 303 



Brinton, D. Gr. 



Obituary Notice of Dr. Hays 248,259 



The Society's Name 553 



Britton, B. 



Small Specimen-Rock Crusher for Laboratory Use 180 



Cattell, Wm. C. 



The Study of Languages 513 



Chase, P. E. 



Crucial Harmonies ... S, 31 



The Limiting Constant of Gravitation 39,41 



Note on the Density of the Kinetic Ether 44 



The Philosophy of Christianity 123, 183 



P'urther Confirmation of Prediction 207,209 



Solar Records : I. Harmonies of Lockyer's " Basic Lines." II. Spec- 

 tral Estimates of Sun's Distance. III. Relations of Mass . . . .220,221 



Approximate Quadrature of the Circle 281,353 



Sun's Apparent Diameter and the Nebular Origin of (he Terrestrial 



Day 37S, 380 



Velocity of Light and Kirkwood's Analogy 409,425 



Controlling Centres 409,429 



