C O N TENT S. 



Page 



Aet. XII. — Effect of a Magnetic Field on Ionization Cur- 

 rents ; by W. Duane 121 



XIII. — Index Ellipsoid (Optical Indicatrix) in Petrographic 



Microscope Work ; by F. E. Wright _ _ _ . 133 



XIV. — Lava Fountains of Kilauea ; by P. A. Perret 139 



XV. — Some Interesting New Species of Arthropods from 



Devonian Strata of Illinois ; by T. E. Savage 149 



XVI. — Mechanism of the Chlorination of Benzene in the 

 Electrolytic Cell ; by P. G. Van Name and C. H. 

 Maryott __ 153 



XVII.— Note on Artificial Sperrylite ; by H. L. Wells 171 



XVIII. — Dana's Confirmation of Darwin's Theory of Coral 



Reefs ; by W. M. Davis _ .. 173 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — The Isomer of the Potassium Ferrieyanide, Hauser 

 and Biesalski : Osmium Tetroxide as an Oxygen Carrier, K. A. Hofmann, 

 189. — New Gasometric Method for Determining Nitric Oxide, Baudisch 

 and Klinger : Preparation of Organic Compounds, E. DeB. Barnett : 

 A Dictionary of Applied Chemistry, Sir E. Thorpe, 190. — Theory of 

 Measurements, A. de F. Palmer : Physical Laboratory Guide, F. C. 

 Eeeve, 191. — Energy System of Matter, J. Weir: Electricity and Mag- 

 netism, S. G. Starling, 192.— Studies in Radioactivity, W. H. Bragg: 

 Electric Lighting, W. S. Franklin : Lehrbuch der Optik, E. Gehrcke, 

 193. — Laboratory Manual of Alternating Currents, J. H. Morecroft, 194. 



Geology and Natural His tory— Cambrian Brachiopoda, C. D. Walcott, 

 194. — Index to the Stratigraphy of North America, B. Willis : Lehrbuch 

 der Palaozoologie, E. S. v. Reichenbach, 195. — Paleolithic man, S. Wood- 

 ward : Isostasy, a rejoinder to the article by Harmon Lewis, J. F. 

 Hayford, 196. — Investigation of the theory of Isostasy in India, H. L. 

 Crosthwait : Effect of Topography and Isostatic Compensation upon the 

 Intensity of Gravity, W. Bowie : Making of the Earth, J. W. Gregory, 

 197. —Geological Society of America: Gems and Precious Stones of the 

 United States, 198. — College Zoology, R. W. Hegner : House-flies and 

 how they Spread Disease, C. G. Hewitt, 199. 



Miscellaneous Scientific Intelligence — Journal of the Academy, of Natural 

 Sciences of Philadelphia, 199. — Report of the' Secretary of the Smithsonian 

 Institution, 200. — Annual Report of the Board of Regents of the Smith- 

 sonian Institution : Report of the Librarian of Congress, 201. — Bjerknes' 

 Dynamic Meteorology, 202. — Founders of Modern Psychology, G. S. Hall : 

 Publications of the Princeton University Observatory : Publications of 

 the Allegheny Observatory of the University of Pittsburgh : Libya Italica, 

 P. V. de Regny : Archiv fur Zellforschung, 203. 



Obituary — L. Swift : G. A. Koenig j E. v. Koken : S. A. Saunders, 204. 



