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Stated Meeting, August 16, 1878
Vol 18, Iss 102, Page 1, Date 1878
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Stated Meeting, September 20, 1878
Vol 18, Iss 102, Page 2, Date 1878
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Stated Meeting, October 4, 1878
Vol 18, Iss 102, Page 3, Date 1878
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Contributions from the University of Pa., No. XV. Preliminary Notice on Chromometry, a New Branch of Quantitative Analysis with the Blowpipe
Vol 18, Iss 102, Page 29, Date 1878
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The Limiting Constant of Gravitation
Vol 18, Iss 102, Page 41, Date 1878
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On the Scales of Maps
Vol 18, Iss 102, Page 47, Date 1878
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Circumstances Influencing the Efficiency of Dynamo-Electric Machines
Vol 18, Iss 102, Page 58, Date 1878
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Stated Meeting, Nov. 15, 1878
Vol 18, Iss 102, Page 61, Date 1878
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Stated Meeting, December 6, 1878
Vol 18, Iss 102, Page 83, Date 1878
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Stated Meeting, December 20, 1878
Vol 18, Iss 102, Page 87, Date 1878
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Movements of Troops in Cities in Cases of Riot or Insurrection
Vol 18, Iss 102, Page 89, Date 1878
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Contribution to the Lithology of Pennsylvania. On the Physical and Chemical Characteristics of a Trap Occurring at Williamson's Point
Vol 18, Iss 102, Page 96, Date 1878
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On the Total Solar Eclipse of July 29th, 1878
Vol 18, Iss 102, Page 103, Date 1878
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Notes on a Series of Analyses of the Dolomitic Limestone Rocks of Cumberland County, Pa., Made by Messrs. Hartshorne and Hartranft in the Laboratory of the Second Geological Survey of Pennsylvania
Vol 18, Iss 102, Page 114, Date 1878
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The Philosophy of Christianity
Vol 18, Iss 103, Page 123, Date 1879
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Stated Meeting, January 3, 1879
Vol 18, Iss 103, Page 153, Date 1879
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A Contribution to the Geology of the Lower Amazonas
Vol 18, Iss 103, Page 155, Date 1879
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Stated Meeting, January 17, 1879
Vol 18, Iss 103, Page 178, Date 1879
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Stated Meeting, February 7, 1879
Vol 18, Iss 103, Page 181, Date 1879
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Preliminary Notice of an Investigation on "Petrocene", a Product of the Destructive Distillation of Petroleum
Vol 18, Iss 103, Page 185, Date 1879
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Character of Some Sullivan County Coals
Vol 18, Iss 103, Page 186, Date 1879
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Notes upon the Collection of Coins and Medals Now upon Exhibition at the Pennsylvania Museum and School of Industrial Art, Memorial Hall, Fairmount Park, Philadelphia
Vol 18, Iss 103, Page 191, Date 1879
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Stated Meeting, February 21, 1879
Vol 18, Iss 103, Page 206, Date 1879
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Further Confirmations of Prediction
Vol 18, Iss 103, Page 209, Date 1879
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Stated Meeting, March 7, 1879
Vol 18, Iss 103, Page 210, Date 1879
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Stated Meeting, March 21, 1879
Vol 18, Iss 103, Page 212, Date 1879
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Analysis of a Calculus Found in a Deer
Vol 18, Iss 103, Page 213, Date 1879
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A Brief Account of the Earthquake at Aix la Chapelle (Aachen) on Monday, August 26, 1878
Vol 18, Iss 103, Page 216, Date 1879
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Stated Meeting, April 4, 1879
Vol 18, Iss 103, Page 217, Date 1879
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On a Branch of Cordaites, Bearing Fruit
Vol 18, Iss 103, Page 222, Date 1879
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Solar Records
Vol 18, Iss 103, Page 224, Date 1879
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Obituary Notice of Robert Frazer
Vol 18, Iss 103, Page 233, Date 1879
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Stated Meeting, April 18, 1879
Vol 18, Iss 103, Page 235, Date 1879
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Stated Meeting, May 2, 1879
Vol 18, Iss 103, Page 237, Date 1879
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On Meteoric Fireballs Seen in the United States during the Year Ending March 31, 1879
Vol 18, Iss 103, Page 239, Date 1879
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Stated Meeting, May 16, 1879
Vol 18, Iss 103, Page 247, Date 1879
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The Geology of the Diamantiferous Region of the Province of Paraná, Brazil
Vol 18, Iss 103, Page 251, Date 1879
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Obituary Notice of the Late Isaac Hays, M. D
Vol 18, Iss 103, Page 259, Date 1879
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Fossil (?) Forms in the Quartzose Rocks of the Lower Susquehanna
Vol 18, Iss 104, Page 277, Date 1879
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On Pyrophyllite from Schuylkill County, Pennsylvania
Vol 18, Iss 104, Page 279, Date 1879
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Approximate Quadrature of the Circle
Vol 18, Iss 104, Page 281, Date 1879
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Notes on Some Land-Shells of the Pacific Slope
Vol 18, Iss 104, Page 282, Date 1879
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Surface Geology of South-West Pennsylvania and Adjacent Portions of West Virginia and Maryland
Vol 18, Iss 104, Page 289, Date 1879
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The Philosophy of the Biblical Account of Creation
Vol 18, Iss 104, Page 316, Date 1879
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The Cosmogony of Laplace
Vol 18, Iss 104, Page 324, Date 1879
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On the Formation of Dibenzyl by the Action of Ethylene Chloride on Benzol in the Presence of Aluminium Chloride
Vol 18, Iss 104, Page 345, Date 1879
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On Dioxyethyl-Methylene, and the Preparation of Methylene Chloride
Vol 18, Iss 104, Page 346, Date 1879
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On the Coördination of the Various Methods of Expressing Thought as Applied to the System of Public School Instruction
Vol 18, Iss 104, Page 348, Date 1879
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Stated Meeting, June 20, 1879
Vol 18, Iss 104, Page 351, Date 1879
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Stated Meeting, July 18, 1879
Vol 18, Iss 104, Page 353, Date 1879
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Stated Meeting, August 15, 1879
Vol 18, Iss 104, Page 355, Date 1879
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Stated Meeting, September 19, 1879
Vol 18, Iss 104, Page 356, Date 1879
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Stated Meeting, October 3, 1879
Vol 18, Iss 104, Page 358, Date 1879
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Stated Meeting, November 7, 1879
Vol 18, Iss 104, Page 361, Date 1879
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Stated Meeting, November 21, 1879
Vol 18, Iss 104, Page 362, Date 1879
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Stated Meeting, December 5, 1879
Vol 18, Iss 104, Page 364, Date 1879
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Second Contribution to a Knowledge of the Miocene Fauna of Oregon
Vol 18, Iss 104, Page 370, Date 1879
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Stated Meeting, December 19, 1879
Vol 18, Iss 104, Page 377, Date 1879
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Astronomical Approximations. I. Apparent Semi-Diameter of the Sun, and Nebular Origin of the Terrestrial Day
Vol 18, Iss 104, Page 380, Date 1879
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Stated Meeting, January 2, 1880
Vol 18, Iss 105, Page 409, Date 1880
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Stated Meeting, January 16, 1880
Vol 18, Iss 105, Page 411, Date 1880
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Stated Meeting, February 6, 1880
Vol 18, Iss 105, Page 413, Date 1880
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Stated Meeting, February 20, 1880
Vol 18, Iss 105, Page 415, Date 1880
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Stated Meeting, March 5, 1880
Vol 18, Iss 105, Page 417, Date 1880
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On the Constitution of the Bradford Oil Sand
Vol 18, Iss 105, Page 419, Date 1880
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An Obituary Notice of the Late John W. Harden
Vol 18, Iss 105, Page 422, Date 1880
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Astronomical Approximations. II, III
Vol 18, Iss 105, Page 425, Date 1880
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The Relations of the Crystalline Rocks of Eastern Pennsylvania to the Silurian Limestones and the Hudson River Age of the Hydromice Schists
Vol 18, Iss 105, Page 435, Date 1880
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An Account of an Old Work on Cosmography
Vol 18, Iss 105, Page 443, Date 1880
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On a New Synthesis of Saligenin
Vol 18, Iss 105, Page 451, Date 1880
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On the Foramina Perforating the Posterior Part of the Squamosal Bone of the Mammalia
Vol 18, Iss 105, Page 452, Date 1880
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Biographical Notice of Professor Joseph Henry
Vol 18, Iss 105, Page 461, Date 1880
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The Timucua Language
Vol 18, Iss 105, Page 465, Date 1880
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A Mirror for Illuminating Opaque Objects for the Projecting Microscope
Vol 18, Iss 105, Page 503, Date 1880
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Erratum
Vol 18, Iss 105, Page 510, Date 1880