Vlll CONTENTS. 



Number 174. 



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 



XLIII. — 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.) 497 



XLV. — Effect of Certain Magnetic and Gravitational Forces 



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



XLVI. — Use of Silver in the Determination of Molybdenum, 

 Vanadium, Selenium and Tellurium ; by Claude C. 

 Perkins . 540 



XLVII. — Chemical Composition of Hulsite and Paigeite, by 



Waldemak 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. Eubens 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 Eegionalen Geologie 

 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. Eeyer : 

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

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

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

 M. E. Etce and B. McCollum, 560. 



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

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

 Landolt, E. Philtppi, Eichard Abegg, 566. 



Tndex to Vol. XXIX, 567. 



