CONTENTS OF VOLUME XLIV. 



Number 259. 



Page. 



Art. I. — The Change of Heat Conductivity on passing Iso- 



thermally from Solid to Liquid ; by C. Barus 1 



II. — Polybasite and Tennantite from the JYlollie Gibson 



Mine in Aspen, Col.; by S. L. Penfield and S. H. 



Pearce *__ 16 



III. — Post-Laramie Deposits of Colorado ; by W. Cross 19 



IV.— Alkali-Metal Pentahalides ; by H. L. Wells and H. 



L. Wheeler. With their Crystallography; by S. L. 



Penfield. 42 



V. — Fossils in the " Archaean " rocks of Central Piedmont 



Virginia; by N. H. Darton 50 



VI. — Notes on the Cambrian Rocks of Virginia and the 



Southern Appalachians ; by C. D. Walcott 52 



VII. — Synthesis of the minerals Crocoite and Phoenico- 



chroite; by C. Ludeking. 57 



VIII. — A Hint with respect to the Origin of Terraces in 



Glaciated Regions ; by R. S. Tarr. 59 



IX. — Occurrence of a Quartz Bowlder in the Sharon Coal of 



Northeastern Ohio; by E. Orton - 62 



X. — A Method of Increasing the Range of the Capillary 



Electrometer; by J. Whitmore. 64 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — Luminosity of Coal Gas Flames, Lewes, TO. — Measure- 

 ment of Osmotic Pressure, Tammann, 71. — Coefficient of Molecular Depression 

 of Phenol, Juillard and Cdrchod: Determination of Vapor Density under 

 Diminished Pressure, Schall: Jahrbuch der Cherme, R. Meyer, 72. — Chemical 

 Calculations with explanatory notes, problems and answers, R. L. Whiteley: 

 Contributions to the knowledge of the discharge of the Ruhmkorff coil, Tom 

 Moll, 73 — Photography in Colors, G. Lippmann, 75. — Dispersion of the 

 Ultra Red Rays, Dr. Rubens : Electrical Resistance of the Human Body, M. 

 von Frey, 76. 



Geology and Mineralogy. — History of Volcanic Action in the Area of the British 

 Isles, A. Geikie. 76. — New Jersey Geological Report for 1891, J. C. Smock, 

 77. — Progress of the Kentucky Geological Survey, J. R. Procter: Kentucky 

 Geological Survey: Report on Petroleum Natural Gas and Asphalt Rock of 

 Western Kentucky, E. Orton: Geolngical Survey of Alabama, Smith: Manning- 

 ton Oil-field and the history of its development, I. C. White, 78. — N'ew Lower 

 Silurian Lamellibranchiata, chiefly from Minnesota rocks, E. 0. Ulhich: Der 

 Peloponnes, Versuch einer Landeskunde auf geologischer Grundlage. nach 

 Ergebuissen einiger Reisen. A. Philippson : Chiastolite in fossiliferous meta- 

 morphic slates of Portugal J F N Delgado: Striated Garnet from Buck field, 

 Maine. "W. S. Bayley, 79. — Blowpipe Analysis, J. Landauer, 80. 



Miscellaneous Scientific Intelligence. — The Great Earthquake of Japan, 1891, J. 

 Milne and W K Burton, 80. — Congress of Mathematicians and Astronomers: 

 American Association, 81. 



Obituary — Lewis Morris Rutherfurd, 82, 



