j v CONTENTS. 



Number 38. 



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 ; 



by II. A. Pilsbry. (With Plate I.) 126 



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



Starkweather 1 29 



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 cf Beryllium, Lebeau, 155. — Colloidal Silver, Lottebmosee and VON 

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

 douard: Lecons de Chimie Physique professees a l'Universite de Berlin, J. H. 

 Van't Hoff: Outlines of Industrial Chemistry, P. H. Thorp, 151. — Charge of 

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

 of the Coherer in Measuring Electric Waves, 0. Behbendsen, 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, P. 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 P. P. King, 168. 

 — Report of the Governor of Arizona to the Secretary of the Interior: Pie 

 Irlichen Pllanzenfamilien, Engler: Pishes of North and Middle America, 

 i>. s. Jordan and B. W. Evebmann, 169. 



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

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



