CONTENTS. 



Number 165. 



Page 

 Art. XXIII. — Physiography of the Central Andes : I. 



The Maritime Andes ; by I. Bowman 197 



XXIV. — Geology and Structure of the Ancient Vol- 

 canic Rocks of Davidson County, North Carolina, by 

 J. E. Pogue, Je 218 



XXV. — Electric Arc between Metallic Electrodes ; by 



W. G. Cadt. (Third paper) 239 



XXVI. — Initial Velocities of the Electrons Produced 



by Ultra- Violet Light ; by A. W. Hull 251 



XXVII. — New Declination Instrument ; by C. C. Hutchins 260 



XXVIII. — Relation between the Refractive Index and 

 the Density of some Crystallized Silicates and Their 

 Glasses ; by E. S. Larsen 263 



XXIX. — Note on the Miocene Drum Fish — Pogonias 



multidentatus (Cope); by B. Smith 275 



XXX. — Description of Tertiary Insects, VII ; by T. 



D. A. COCKERELL 283 



XXXI. — Method for the Iodometric Determination of 

 Silver Based upon the Reducing Action of Potassium 

 Arsenite ; by R. S. Bosworth 287 



SCIENTIFIC INTELLIGENCE. 

 Obituary — Simon Newcomb, 290 ; Samuel William Johnson, 292. 



