VI CONTENTS. 



Number 112. 



Page 

 Art. XXIII. — Bearing of Physiography upon Suess' Theo- 

 ries; by W. M. Davis ." 265 



XXIV. — Progress of the Albatross Expedition to the Eastern 



Pacific ; by A. Agassiz 274 



XXV. — Replacement of Quartz by Pyrite and Corrosion of 



Quartz Pebbles ; by C. H. Smyth, Je. (With Plate II) 277 

 XXVI. — Occurrence and Distribution of Celestite-Bearing 



Rocks ; by E. H. Kraus 286 



XXVII. — Note on Interference with the Bi-Prism ; by W. 



McClellan .., .___... _.. 294 



XXVIII. — Doughty Springs, a Group of Radium-bearing 



Springs, Delta County, Colorado ; by W. P. Headden . 297 

 XXIX. — Error of Collimation in the Human Eye ; by C. S. 



Hastings 310 



XXX. — New Form of Electrode for Lead Storage Cells ; by 



H. M. Dadoueian _ 315 



XXXI.— Chrysoberyl from Canada ; by N. N . Evans 316 



XXXII. — Souesite 1 a native iron-nickel alloy occurring in 



the auriferous gravels of the Fraser, province of British 



Col umbia, Canada ; by G. C. Hoffmann 319 



XXXIII. — Absence of Helium from Carnotite ; by E. P. 



Adams 321 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Properties of Methane, Moissan : Silicide of Carbon 

 in the Canon Diablo Meteorite, Moissan : New Process for Detecting 

 Ammonia in Water, Trillot and Turchet, 323. — Radio-tellurium, Marck- 

 wald : Conversations on Chemistry, Part I, General Chemistry, W. 

 Ostwald, 324. — Text-book of Organic Chemistry, H. Leffmann and C. 

 H. LaWall : Electric Inertia, S. H. Burbury : Double Eefractions, F. 

 Braun, 325. — Emission Spectra of the Metals in an Electric Oven, A. S. 

 King, 326. — Dynamics of Particles and of Rigid, Elastic, and Fluid 

 Bodies, A. G. Webster : Experimented Untersuchung von Gasen, M. W. 

 Travers, 327. — Dynamical Theory of Gases, J. H. Jeans, 328.— Optical 

 Pyrometry, C. W. Waidner and G. K. Burgess, 329. 



Geology and Mineralogy — Cambrian Brachiopoda with Descriptions of New 

 Genera and Species, C. D. Walcott, 329. — Occurrence of Mastodon 

 humboldtii in Northern Mexico, C. Sheldon : Petrography and Geology 

 of the Igneous Rocks of the Highwood Mts. , Montana, L. V. Pirsson : 

 Red Beryl from Utah, W. E. Hillebrand, 330. — Nickel and Copper 

 Deposits of the Sudbury Mining District, Ontario, Canada, A. E. Barlow, 

 331. 



Miscellaneous Scientific Intelligence — Studies in General Physiology, J. Loeb : 

 Birds of North and Middle America, R. Ridgway : British Museum 

 Catalogue, 332. 



