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Stated Meeting, March 19, 1880
Vol 19, Iss 107, Page 1, Date 1880
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Astronomical Approximations. IV. Nodal Estimation of the Velocity of Light
Vol 19, Iss 107, Page 4, Date 1880
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An Account of Two Maps of America Published Respectively in the Years 1550 and 1555
Vol 19, Iss 107, Page 10, Date 1880
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On the Action of Hydrochloric Acid and of Chlorine on Acetobenzoic Anhydride
Vol 19, Iss 107, Page 13, Date 1880
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Stated Meeting April 2, 1880
Vol 19, Iss 107, Page 14, Date 1880
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On the Origin of Planets
Vol 19, Iss 107, Page 15, Date 1880
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Stated Meeting, April 16, 1880
Vol 19, Iss 107, Page 16, Date 1880
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Astronomical Approximations. V., VI
Vol 19, Iss 107, Page 18, Date 1880
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Relations of Chemical Affinity to Luminous and Cosmical Energies
Vol 19, Iss 107, Page 21, Date 1880
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Stated Meeting, May 7, 1880
Vol 19, Iss 107, Page 25, Date 1880
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Obituary Notice of Michel Chevalier
Vol 19, Iss 107, Page 28, Date 1880
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Second Contribution to the History of the Vertebrata of the Permian Formation of Texas
Vol 19, Iss 107, Page 38, Date 1880
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Stated Meeting, May 21, 1880
Vol 19, Iss 107, Page 59, Date 1880
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Some Recent Discoveries of Stone Implements in Africa and Asia
Vol 19, Iss 107, Page 63, Date 1880
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Stated Meeting, June 18, 1880
Vol 19, Iss 107, Page 69, Date 1880
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Stated Meeting, July 16, 1880
Vol 19, Iss 107, Page 75, Date 1880
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On the Genera of the Creodonta
Vol 19, Iss 107, Page 76, Date 1880
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Stated Meeting, August 20, 1880
Vol 19, Iss 107, Page 82, Date 1880
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Notes Respecting a Re-Eroded Channel-Way
Vol 19, Iss 107, Page 84, Date 1880
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Notes on the Geology of Wise, Lee and Scott Counties, Virginia
Vol 19, Iss 107, Page 88, Date 1880
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Stated Meeting, September 17, 1880
Vol 19, Iss 107, Page 107, Date 1880
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Notes on the Cumberland or Potomac Coal Basin
Vol 19, Iss 107, Page 111, Date 1880
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Stated Meeting, October 1, 1880
Vol 19, Iss 107, Page 117, Date 1880
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Memoir of George B. Wood, M. D., LL. D
Vol 19, Iss 107, Page 118, Date 1880
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Stated Meeting, October 15, 1880
Vol 19, Iss 107, Page 153, Date 1880
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Stated Meeting, Nov. 5, 1880
Vol 19, Iss 107, Page 158, Date 1880
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Obituary Notice of Dr. John Neill
Vol 19, Iss 107, Page 161, Date 1880
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A Review of the Species of "Anisodactylus" Inhabiting the United States
Vol 19, Iss 107, Page 162, Date 1880
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Critical Notes on the Species of "Selenophorus" of the United States
Vol 19, Iss 107, Page 178, Date 1880
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List of Papers Communicated to the American Philosophical Society
Vol 19, Iss 107, Page 184, Date 1880
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Stated Meeting, November 19, 1880
Vol 19, Iss 107, Page 191, Date 1880
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Stated Meeting, December 3, 1880
Vol 19, Iss 107, Page 194, Date 1880
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Stated Meeting, Dec. 17, 1880
Vol 19, Iss 107, Page 196, Date 1880
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Notes on the Place of the Sharon Conglomerate in the Palœozoic Series
Vol 19, Iss 107, Page 198, Date 1880
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Photodynamics
Vol 19, Iss 107, Page 203, Date 1880
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Stated Meeting, January 7, 1881
Vol 19, Iss 108, Page 211, Date 1881
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Obituary Notice of Peter McCall
Vol 19, Iss 108, Page 213, Date 1881
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Note on the Protection of Oil Tanks from Lightning Stroke
Vol 19, Iss 108, Page 216, Date 1881
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Stated Meeting, January 21, 1881
Vol 19, Iss 108, Page 217, Date 1881
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A Geological Reconnaissance of Parts of Lee, Wise, Scott and Washington Counties, Virginia
Vol 19, Iss 108, Page 219, Date 1881
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Photodynamic Notes
Vol 19, Iss 108, Page 262, Date 1881
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Stated Meeting, February 4, 1881
Vol 19, Iss 108, Page 274, Date 1881
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The Upper Freeport Coal Bed along Laurel Ridge in Preston County of West Virginia
Vol 19, Iss 108, Page 276, Date 1881
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Memoir of S. S. Haldeman, A. M., Ph. D., etc
Vol 19, Iss 108, Page 279, Date 1881
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Stated Meeting, February 18, 1881
Vol 19, Iss 108, Page 285, Date 1881
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On a Cours de Botanique Fossile by Prof. M. B. Renault
Vol 19, Iss 108, Page 287, Date 1881
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Certain Almanacs Published in Philadelphia between 1705 and 1744
Vol 19, Iss 108, Page 291, Date 1881
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Stated Meeting, March 4, 1881
Vol 19, Iss 108, Page 298, Date 1881
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Stated Meeting, March 18, 1881
Vol 19, Iss 108, Page 299, Date 1881
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Discovery of the Preglacial Outlet of the Basin of Lake Erie into That of Lake Ontario; With Notes on the Origin of Our Lower Great Lakes
Vol 19, Iss 108, Page 300, Date 1881
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Geological Section at St. Mary's, Elk County, Pennsylvania
Vol 19, Iss 108, Page 337, Date 1881
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Stated Meeting, April 1, 1881
Vol 19, Iss 108, Page 348, Date 1881
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Stated Meeting, April 15, 1881
Vol 19, Iss 108, Page 353, Date 1881
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The Systematic Arrangement of the Order Perissodactyla
Vol 19, Iss 108, Page 377, Date 1881
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Note on the Structure of the Posterior Foot of Toxodon
Vol 19, Iss 108, Page 402, Date 1881
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Stated Meeting, May 6, 1881
Vol 19, Iss 108, Page 403, Date 1881
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An Analysis of the Fire-Damp Explosions in the Anthracite Coal Mines, from 1870 to 1880
Vol 19, Iss 108, Page 405, Date 1881
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Stated Meeting, May 20, 1881
Vol 19, Iss 108, Page 408, Date 1881
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Notes on an Egyptian Element in the Names of the Hebrew Kings, and Its Bearing on the History of the Exodus
Vol 19, Iss 108, Page 409, Date 1881
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Notes on the Geology of West Virginia
Vol 19, Iss 109, Page 438, Date 1881
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Contributions from the University of Pennsylvania, No. 16. On Alaskaite, a New Member from the Series of Bismuth Sulphosalts
Vol 19, Iss 109, Page 472, Date 1881
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On Some Mammalia of the Lowest Eocene Beds of New Mexico
Vol 19, Iss 109, Page 484, Date 1881
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Stated Meeting, October 7, 1881
Vol 19, Iss 109, Page 496, Date 1881
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Notes on the Quinnimont Coal Group in Mercer Co. of West Virginia and Tazewell Co. of Virginia
Vol 19, Iss 109, Page 498, Date 1881
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Notes on the Coal-Field near Cañon City, Colorado
Vol 19, Iss 109, Page 505, Date 1881
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Stated Meeting, October 21, 1881
Vol 19, Iss 109, Page 521, Date 1881
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The Brain of the Cat, Felis Domestica. 1. Preliminary Account of the Gross Anatomy
Vol 19, Iss 109, Page 524, Date 1881
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Photodynamic Notes, IV
Vol 19, Iss 109, Page 567, Date 1881
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The Names of the Gods in the Kiche Myths, Central America
Vol 19, Iss 109, Page 613, Date 1881