CONTENTS TO VOLUME XXI. 



Niii^.jer 121. 



Page 

 Art. I. — The Heating Effects produced by Rontgen Rays in 

 Different Metals, and their Relation to the Question of 

 Changes in the Atom ; by H. A. Bumstead 1 



II. — On a Method of Determining the Specific Gravity of 

 Soluble Salts by Displacement in their own Mother- 

 liquor ; and its Application in the case of the Alkaline 

 Halides ; by J. Y. Buchanan 25 



III. — Further Work on the Interaction of Hydrochloric Acid 

 and Potassium Permanganate in the Presence of Various 

 Inorganic Salts ; by James Brown 41 



IV. — Some Western Klamath Stratigraphy ; by Oscar H. 



Hershey 58 



V. — A Study in the Metamorphic Rocks of the St. Francis 



Valley, Quebec; by Joh^ A. Dresser . 67 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — The Hydrides of the Alkaline Metals, Moissan, 77. — 

 The Boiling-points of the Alkaline Metals, Ruff and Johannsen : The 

 Rusting of Iron, Dunstan, Jowett and Goulding : The Cause of Color in 

 the Iron-Cyanogen Compounds, Hofmann and Resenscheck, 78. — Re- 

 searches on the Affinities and on the Causes of the Chemical Similarity or 

 Dissimilarity of Elements and Compounds, Geoffrey Martin : Verflus- 

 sigtes Ammoniak als Losungsmittel, J. Bronn, 79. — Annual Reports of the 

 Progress of Chemistry for 1904 : A New Kind of X-Ray, W. Seitz : Mag- 

 netizing by Rapidly Oscillating Currents, Madeltjng : Influence of the 

 Earth in Wireless Telegraphy, J. S. Sachs, 80.' — Elektrische Kraftuber- 

 tragung, Wilhelm Philippi, 81. 



Geology and Natural History. — United States Geological Survey, 81.— 

 Geology of the Central Copper River Region, Alaska, Walter C. Men- 

 denhall, 82. — Geology of the Tonopah Mining District, Nevada, Josiah 

 Edward Spurr, 83. — The Lead, Zinc and Fluorspar Deposits of Western 

 Kentucky, E. 0. Ulrich and W. S. Tangier Smith, 84. — Die chemische 

 Beschaffenheit von Eruptivgesteinen Finnlands und der Halbinsel Kola im 

 Lichte des neuen amerikanischen Systemes, V. Hackman : Preliminary 

 Announcement Concerning a New Mercury Mineral from Terlingua, Texas, 

 W. F. Hillebrand, 85. — The Rodeo Meteoi*ite, Farrington : The Shel- 

 burne Meteorite, L. H. Borgstrom, 86. — Bulletins of the New York State 

 Museum : Bibliographical Index of North American Fungi, William G. 

 Farlow, 87. — The Oyster, a Popular Summary of a Scientific Study. 

 William K. Brooks, 88. 



