CON 'J' K N T S 



Page 



Art. IX. — The Problem of Continental Fracturing and Dias- 



trophism in Ooeanica; by C. Schuchert 91 



X. — On the Qualitative Separation and Detection (I) of 



Tellurium and Arsenic and (II) of Iron, Thallium, Zir- 

 conium and Titanium ; by P. E. Browning, G. S. 

 Simpson and L. E. Porter iog 



XI. — The Separation of Vanadium from Phosphoric and 



Arsenic Acids and from Uranium; by W. A. TuRNRR.. 109 



XII. — Some Notes on Japanese Minerals; by S. ICHIKAWA.. Ill 



XIII. — The Algonkian-Cambrian Boundary East of the 



Green Mountain Axis in Vermont; by T. N. Dale 120 



XIV. — The Thermochemistry of Silicon; Heat of Combina- 

 tion of Silica with Water; by W. G. Mixtkr 125 



XV.— Composition of the Selensulphur from Hawaii; by G. 



V. Brown 132 



XVI. — Insects in Burmese Amber; by T. D. A. Cockerell 135 



XVII. — The Preparation and Properties of Lead-Chlor 

 Arsenate, Artificial Mimetite ; by C. C. McDonnell 

 and C. M. Smith 139 



XVIII. — The Effect of a Magnetic Field on the Initial Re- 

 combination of the Ions Produced by X-Rays in Air; 

 by G. E. M. Jauncey 1-16 



XIX. — The Separation of Thorium from Iron with the Aid 

 of the Ammonium Salt of Nitrosophenylhydroxylamine 

 (" Cupferron ") ; by W. M. Thornton, J r 151 



XX. — On the Quantitative Estimation of Small Quantities of 



Sulphide Sulphur; by W. A. Drushel and C. M. Elston 155 

 . XXI. — Margarosanite, a New Lead-Calcium Silicate from 



Franklin, N. J.; by W. E. Ford and W. M. Bradley.. 159 



XXII. — On the Paleozoic Alcyonarian, Tumularia; by W. I. 



Robinson 1G2 



SCIENTIFIC INTELLIGENCE. 



Chemistry— Organic Agricultural Chemistry, J. S. Chamberlain: Outlines 



of Industrial Chemistry, F. H. Thorp, 105. — Method for the Identification 



of Pure Organic Compounds, S. P. Mulliken: Annual Reports of the 



Progress of Chemistry for 1915, 166. 

 Geoloyy— Origin of the Earth, T. C. Chamberlin, 167. — Jointing as a 



Fundamental Factor in the Degradation of the Lithosphere, by F. 



Ehbenfeld, 168. — The Fauna of the Chapman Sandstone of Maine, H. S. 



Williams, 169. 

 Miscellaneous Scientific Intelligence — A Comprehensive Plan of Insurance 



and Annuities for College Teachers, H. S. Pritchett, 169. 

 Obituary — W. Eamsay: K. Metchnikofp, 170. 



