CONTENTS. 



Page 



Art. I. — Energy of the Cathode Hays; by W. Ox. Cady 1 



II. — Volcanic Rocks from Temiscouata Lake, Quebec; by 



H. E.Gregory 14 



III. — Interpretation of Mineral Analyses : a Criticism of re- 

 cent Articles on the Constitution of Tourmaline ; by S. 

 L. Penfield .. 19 



IV. — Studies in the Cyperacete, No. XIII ; by T. Holm 33 



V. — Titration of Mercury by Sodium Thiosulphate ; by J. 



T. Norton, Jr 48 



VI. — Selenium Interference Rings ; by A. C. Longden 55 



VII. — Carboniferous Bowlders from India ; by B. K. Emer- 

 son 57 



VIII. — New Bivalve from the Connecticut River Trias ; by 



B. K. Emerson 58 



IX. — Statement of Rock Analyses ; by H. S. Washington. 59 



X. — String Alternator ; by K. Honda and S. Shimizu 64 



XI. — Action of Light on Magnetism; by J. H. Hart 66 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Radio-active Barium, B. v. Lengyel, 74, — Mercuric 

 Antimouide, and Stibonium Compounds, Partheil and Mannheim: Atomic 

 Weight of Iron, Richards and Baxter: Physical Properties of Caesium, 

 Eckardt and G-raepe, 75. — Compounds of Telluric Acid with Iodates, Wein- 

 land and Prause: Simple Method of Decomposing Chromite, Fieber: Theory 

 of Electrolytic Dissociation and some of its Applications, H. C. Jones : Optical 

 Activity and Chemical Composition, H. Landolt: Yariation of the Electric In- 

 tensity and Conductivity along the Electric Discharge in Rarefied Gases, Wil- 

 son. 76. — Mechanical possibilities of flight, Rayleigh: Magnetic Screening, H. 

 DuBois and A. P. Wills: Sun's Corona, E. Pringsheim, 77. — Some Proper- 

 ties of Light-struck Photographic Plates, F. E. Nipher, 78. 



Geology and Mineralogy — Monograph of Christmas Island (Indian Ocean): Phys- 

 ical Features and Geology, C. W. Andrews, 79. — Lower Silurian (Trenton) 

 Fauna of Baffin Land, C. Schuchert: Preliminary Report on the Geology of 

 Louisiana, G. D. Harris and A. C. Veatch, 81. — Geology of Panama, Ber- 

 trand and Zurcher : Enrichment of Mineral of Veins by later Metallic Sul- 

 phides, W. EL Weed, 82. — Mineralogical Notes, 0. C. Farrington, 83. — 

 Tabellen zur Bestimmung der Mineralien mittels ausserer Kennzeichen, A. 

 Weisbach : Repertorium der Mineralogischen und Krystallographischen Liter- 

 atur, E. Weinschenk and F. Grunling, 84. 



Botany and Zoology — Carex de l'Asie orientale, A. Franchet, 84. — Systematische 

 Anatomie der Dicotyledonen, H Solereder, 85. — Elements de Paleobotanique, 

 R. Zeiller : Lehrbuch der Pflanzenpalaeontologie mit besonderer Riicksicht 

 auf die Bediirfnisse der Geologen, H. Potonie, 88. — Birds of Eastern North 

 America, C. B. Cory: Zoological Results based on material from New Britain, 

 New Guinea, Loyalty Island and elsewhere, collected during 1895-1897, A. 

 Willey: Das Tierreich, E. Hartert, 89. 



Miscellaneous Scientific Intelligence — Solar Eclipse, 89. — Lessons in Elementary 

 Physiology, T. H. Huxley: Ostwald's Klassiker der Exakten Wissenschaften, 

 90. 



