CONTENTS. 



Page 



Art. X.— Contribution to the Study of Contact Metamor- 



phism ; by J. M. Clements 81 



XL— Origin of Mammals ; by H. F. Osborn 92 



XII. — Chemical Composition of Tourmaline ; by S. L. Pen- 

 field and H. W. Foote ___ 97 



XIII. — Littoral Mollusks from Cape Fairweather, Patagonia ; 



byH. A. Pilsbky. (With Plate I.) 126 



XIV. — Thermodynamic Relations for Steam; by G. P. 



Starkweather 129 



XV. — Descriptions of imperfectly known and new Actinians, 

 with critical notes on other species, III ; by A. E. Ver- 

 rill 143 



XVI. — Volumetric Method for the Estimation of Boric Acid ; 



by L. C. Jones ._. _ - - 147 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics— Molecular Masses of Gases, D. Berthelot : Preparation 

 of Metals and Alloys by means of Aluminum, Goldschmidt, 154. — Electrolytic 

 Preparation of Bery Ilium, Lebeau, 155. — Colloidal Silver, Lottermoser and von 

 Meyer: Silver peroxide and peroxynitrate, Mulder, 156. — Neodymium, Bou- 

 dotjard : Lecons de Chimie Physique professees 4 l'Universite de Berlin, J. H. 

 Van't Hoff': Outlines of Industrial Chemistry, P. H. Thorp, 157. — Charge of 

 Electricity carried by the ions produced by Rontgen Rays, J. J. Thomson: Use 

 of the Coherer in Measuring Electric Waves, 0. Behrendsen, 158. — Color 

 Blindness and the Rontgen Rays, E. Dorn: Regenerating Vacuum Tubes, W. 

 Rollins, 159. 



Geology and Natural History — Age of the Earth, Lord Kelvin, 160. — Recent 

 Publications of the U. S. Geological Survey, 166, — Catalogue of the Cretaceous 

 and Tertiary plants of North America, F. H. Knowlton : Iowa Geological 

 Survey, Annual Report, 1897, S. Calvin: Preliminary Report on a Part of the 

 Gold Deposits of Georgia, W. S. Yeates, S. "W. McCallie and .F. P. King, 168. 

 -—Report of the Governor of Arizona to the Secretary of the Interior: Die 

 naturlichen Pflanzenfamilien, Engler : Fishes of North and Middle America, 

 D. S. Jordan and B. W. Evermann, 1 69. 



Miscellaneous Scientific Intelligence — Ostwald's Klassiker der Exakten Wissen- 

 schaften: University of Tennessee Record of Scientific Engineering, 170. 



