CONTENTS. 



Page 

 Art. XL1I. — Experimental Investigation into the Flow of 



Rocks, by Frank D. Adams, assisted by Ernest G. 



Coker. First Paper— The Flow of Marble. (With 



Plates II-IV) 465 



XLIIL— Heat of Formation of the Oxides of Molybdenum, 



Selenium and Tellurium ; and fifth paper on the Heat of 



Combination of Acidic Oxides with Sodium Oxide ; by 



W. G. Mixter 488 



XLIV. — Contributions to the Geology of the Grand Canyon, 



Arizona. — The Geology of the Shinumo Area (continued); 



by L. F. Noble. (With Plate V.) i 497 



XLV. — Effect of Certain Magnetic and Gravitational Forces 



on the Motion of the Moon ; by Ernest W. Brown 529 



XL VI. — Use of Silver in the Determination of Molybdenum, 



Vanadium, Selenium and Tellurium ; by Claude C. 



Perkins . . _ 540 



XL VII. — Chemical Composition of Hulsite and Paigeite, by 



Waldemar T. Schaller 543 



SCIENTIFIC INTELLIGENCE. 



Chemistry — Gas containing Helium from the German Potash Deposit, E. 

 Erdmann, 549. — Detection of Methyl Alcohol, G. Deniges, 550.— A Sub- 

 stitute for Platinum Wire for Use in Blowpipe Work, 0. F. Kirby : The 

 Use of Sodium Hypobromite in the Separation of Certain Metals, Pozzi- 

 Escott : Doppler Effect in Hydrogen, B. Strasser, 551. —Effect of Dust 

 and Smoke on the Ionization of Air, A. S. Eve : Measurements in the 

 Extreme Infra-Eed Spectrum, H. Rubens and H. Hollnagel, 552. 



Geology — Paleogeography of North America, C. Schuchert, 552.— Virginia 

 Geological Survey, T. L. Watson, 557.— Geological and Archaeological 

 Notes on Orangia, J. P. Johnson : Handbuch der Regionalen Geologic, 

 G. Steinmann and G. Wilckens, 558. 



Miscellaneous Scientific Intelligence — United States Coast and Geodetic 

 Survey, 0. H. Tittmann : Connecticut Geological and Natural History 

 Survey, 559. — Kraft das ist animalische, mechanische, soziale Energien 

 und deren Bedeutung fur die Machtenfaltung der Staaten, E. Reyer : 

 Soziale Machte als Erganzung der Arbeit uber "Kraft," E. Reyer : Pub- 

 lications of the Allegheny Observatory of the University of Pittsburgh, F. 

 Schlesinger and R. H. Baker : Bulletin of the University of Kansas, 

 M. E. Rice and B. McColltjm, 560. 



Obituary. — Alexander Agassiz, 561: Robert Parr Whitfield, 565: Sir 

 William Huggins, Knut Johan Angstrom, Julien Fraipont, H. 

 Landolt, E. Philippi, Richard Abegg, 566. 



Index to Tol. XXIX, 567. 



313 



