IV CONTENTS. 



Number 248. 



Page 



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



trophiem in Ocean ica; by C. ScStjchert 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 I. E. Porter 106 



XI. — The Separation of Vanadium from Phosphoric and 



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



XII. — Some Notes on Japanese Minerals; by S. Ichikaava.. 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. Mixter 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 146 



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

 of the Ammonium Salt of Nitrosophenylhydroxylamine 

 (" Cupferron ") ; by W. M. Thornton, Jr 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 . 162 



SCIENTIFIC INTELLIGENCE. 



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



of Industrial Chemistry, F. H. Thorp, 165.— Method for the Identification 



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



Progress of Chemistry for 1915, 166. 

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



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



Ehrenfeld, 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. Ramsay: B. Metchnikoff, 170. 



