IV CONTENTS. 



Number 140. 



Page 



Art. IX. — Historic Fossil Cycads ; by G-. R. Wieland 93 



X. — Accelerated Cone Growth in Pinus ; by G. R. Wieland 102 



XI. — Ainsworth Meteorite ; by E. E. Howell '105 



XII. — High Level Terraces in Southeastern Ohio ; by G. D. 



Hubbard 108 



XIII. — Triassic Reptile, Hallopus Victor, Marsh ; by F. R. 



vox IIuene and R. S. Lull 113 



XIV. — Species of Grapsoid Crustacean ; by A. E. Veukii.l 11!) 

 XV. — Tourmaline of Crown Point, N. Y. ; by Wm. P. Blake 1 23 

 XVI. — Silurian Fauna in Western America ; byE. M. Kindle 125 

 XVII. — Method for the Volumetric Estimation of Titanium; 



by H. D. Newton 130 



XVIII. — Isopyrum biternatum Torr. et Gr.~ ; by T. Holm .. 133 

 XIX. — Phosphorescence Produced by the Canal Rays ; by 



J. Trowbridge . 141 



XX. — Application of a Longitudinal Magnetic Field to 



X-ray Tubes ; by J. Trowbridge 143 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Condensation of Water Vapor in ttie Presence. of 

 Eadinm Emanation, Mme. Curie : Gaseous Nitrogen Trioxide, Baker and 

 Baker, 145.— Atomic Weight of Tellurium, Baker and Bennett: New- 

 Element, Lutecium, G. Urbain : Association of Helium and Thorium, 

 Strutt : Organic Chemistry for Advanced Students, J. B. Cohen, 146. — 

 Badio-aetivity of Lead and Other Metals, J. C. McLennan : Production 

 and Origin of Radium, E. Rutherford : Radium Emanation in the Atmos- 

 phere near the Earth's Surface, A. S. Eve : Anomalies in the Behavior of 

 Dielectrics, E. R. v. Schweidler : Effect of Pressure upon Arc Spectra, 

 W. G. Dufpield, 147. — Modification of the First Linear Spectrum of 

 Mercury, E. Castelli : Gas from Aluminum Electrodes, R. v. Hirsch and 

 F. Soddy : Two New Worlds, E. E. Fournier d : Albe, 148. 



Geology — United States Geological Survey, G. O. Smith, 149, 150. — Report 

 on the Cretaceous Paleontology of New Jersey, 152. — Die Gastropoden des 

 Karnischen Unterdevon, A. Spitz, 153. — Geologic Map of the Rochester 

 and Ontario Beach Quadrangles, C. A.. Hartnagel : Scapolite Rocks, J. E. 

 Spurr: Geological Structure of the Highlands of Scotland, Peach and 

 Horne : Geological Sections of the Alps : Siidafrika, S. Passarge, 155. — 

 Production of Gold and Silver in 1906, Lindgren : Origin of Meteor Crater, 

 Arizona, H. L. Fairchild, 156.— Granite and Gneiss, J. J. Sederholm, 157. 



Zoology — Madreporaria of the Hawaiian Islands and Laysan, T. W. Vaughan: 

 Madreporaires d'Amboine, M. Bedot : Crustacea of Norway, G. O. Sars : 

 North American Parisitic Copepods, 0. B. Wilson, 158. — Echinoidea of the 

 Danish Ingolf Expedition, T. Mortensen : Bermuda in Periodical Litera- 

 ture, G. W. Cole : Parasites of Bermuda Fishes, E. B. Linton : Fishes of 

 North Carolina, H. M. Smith, 159. — Comparative Anatomy of Vertebrates, 

 W. N. Parker : Natural History Essays, G. Renshaw, 160. 



Miscellaneous Scientific Intelligence — Report of the Secretary of the Smith- 

 sonian Institution, 160. — Report of the U. S. National Museum : Carnegie 

 Institution of Washington ; Year Book No. 6, 162. — Carnegie Foundation 

 for the Advancement of Teaching, 164. — Bulletin of the Mount Weather 

 Observatory : Publications of the Allegheny Observatory : Les Prix Nobel, 

 165. — Mechanics. W. S. Franklin and B. Macnutt, 166. 



Obituary— O. A. Young, 166.— P. J. C. Janssen : P. T. Austin, 168. 



