CONTENTS OF VOLUME XLVIII. 



Number 283. 



Page. 



A.rt. I. — Spiral Goniometry in its Relation to the Measure- 

 ment of Activity ; by C. Barus ... 1 



II. — Occurrence of a large area of Nepheline Syenite in the 



Township of Dungannon, Ontario ; by F. D. Adams 10 



III. — Nepheline, Socialite and Orthoclase from the Nepheline 



Syenite of Dungannon, Ontario; by B. J. Harrington 16 



IV. — New Design for large Spectroscope Slits ; by F. L. O. 



Wadsworth. (With Plate I.) 19 



V. — Tertiary Changes in the Drainage of Southwestern Vir- 

 ginia; by M. R. Campbell 21 



VI. — Methods for the Determination of Water; by S. L. 



Penfield 30 



VII. — Detection of Alkaline Perchlorates associated with 

 Chlorides, Chlorates, and Nitrates; by F. A. Gooch 

 and D. A. Kreider 38 



VIII. — Upper Vicksburg Eocene and the Chattahoochee 

 Miocene of Southwest Georgia and adjacent Florida; 

 by A. F. Foerste 41 



IX. — Gabbros in the Southwestern Adirondack Region ; by 



C. H. Smyth, Jr. _■_ 54 



Appendix. — X. — Footprints of Vertebrates in the Coal Meas- 

 ures of Kansas; by O. C. Marsh. (With Plates II and 

 III.).. 81 



XI. — Typical Ornithopoda of the American Jurassic; by 



O. C. Marsh. (With Plates IV-VIL) 85 



XII. — Eastern Division of the Miohippus Beds with Notes 



on some of the Characteristic Fossils; by O. C. Marsh. 91 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Titration method for determining Molecular Mass' 

 Kuster. 65. — Use of the Lummer-Brodhun prism in Colorimetry, Kruss: Elec- 

 trolysis by Alternating Currents, Hopkinson, Wilson and Lydall, 66. — Source 

 of the Hydrogen Peroxide in the Atmosphere, Bach : Explosive Haloid Com- 

 pounds of Nitrogen, Seliwanow, 67. — Preparation of Phosphorus by the Action 

 of Aluminum upon the Phosphates, Rf >ssel and Frank : Production artificially 

 of the Diamond, Moissan, 68. — Electrical Condition of the air in high altitudes, 

 69. 



Geology and Mineralogy — United States Geological Survey, 70. — Introduction 

 to the Study of the Brachiopoda, J. Hall and J. M. Clarke, 71. — Bibliotheque 

 Geologique de la Russie, S. Nitikin : Illustrations of the Fauna of the St. John 

 Group, G. F. Matthew, 72. — Fossil resin, E. A. Smith: Papers and Notes on 

 the Glacial Geology of Great Britain and Ireland, H. C. Lewis, 73 — Brief notes 

 on some recently described minerals, 74. — Manuel de Mineralogie, A. Des 

 Cloiseaux, 75. 



Astronomy — Total Eclipses of the Sun, M. L. Todd: Publications of the Lick Ob- 

 servatory of the University of California : Prof. M. Updegraff, 76. 



Botany — Guide to Sowerby's Models of British Fungi in the Department of Botany, 

 British Museum, 1893, 76. — Monograph of Lichens found in Britain, J. M. 

 Crombie, 7 7. 



Miscellaneous Scientific Intelligence — Condition of Kilauea, March 20th, 1892, 

 F. S. Dodge: Leicester Earthquake of August 4, 1893, C. Davison, 78— Con- 

 gres Geologique International, S. F. Emmons, 79. — International Congress of 

 applied Chemistry, 80. 



