CONTENTS TO VOLUME IV. 



Number 19. 



Page 



Art. I. — Pressure Coefficient of Mercury Resistance ; by A. 



deF. Palmer, Jr. _ — 1 



II. — Ctenacanthus Spines from the Keokuk Limestone of 



Iowa ; by C. R. Eastman 10 



III. — Studies in the Cyperaceae, V. ; by T. Holm 13 



IV. — Identity of Chalcostibite (Wolfsbergite) and Gruejarite, 



and on Chalcostibite from Huanchaca, Bolivia ; by S. L. 



Penfield and A. Frenzel 27 



V. — Interesting Case of Contact Metamorphism ; by H. W. 



Fairbanks 36 



VI. — Tin Deposits at Temescal, Southern California; by H. 



W. Fairbanks 39 



VII. — Outlying Areas of the Comanche Series in Oklahoma 



and Kansas ; by T. W. Vaughan _ . 43 



VIII.— Electrosynthesis ; by W. G. Mixter 51 



IX. — Monazite from Idaho ; by W. Lindgren . . _ _ . . 63 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Viscosity of Mixtures of Miscible Liquids, Thorpe and 

 Rodger : Specific Heats of the Gaseous Elements, Berthelot, 65. — Synthetic 

 Action of the Dark Electric Discharge, Losanitsch and Jovitschitsch : Struc- 

 tural Isomerism in Inorganic Compounds, Sabaneeff, 66. — Phase Rule, W. D. 

 Bancroft, 6*7. — Yorlesungen iiber Bildung und Spaltung von Doppelsalzen, 68. 

 — Limits of Audition, Lord Ratleigh, 69. — Polarization Capacity, C. M. Gor- 

 don: Oscillatory Currents arising in Charging a Condenser, Seiler : Cathode 

 Rays, 71. — Application of the Rontgen Rays to Surgery: Transparency of 

 Ebonite, M. Perrigot : Theory of Electricity and Magnetism, A. G. Webster, 

 72.— Light and Sound, E. L. Nichols and W. S. Franklin, 73. 



Geology and Mineralogy — Examination of Deposits obtained from borings in the 

 Nile Delta, J. W. Judd, 74. — Underground Temperatures at Great Depths, W. 

 Hallock: Depth of Peat in the Dismal Swamp, G. R. Wieland: Currituck 

 Sound, Virginia and North Carolina, G. R. Wieland, 76. — Papers on Dsemone- 

 lix: Genesis and Matrix of the Diamond, Lewis and Bonnet, 77. — Transac- 

 tions of the Geological Society of South Africa : Geological Survey of Canada, 

 G. C. Hoffmann, 78. 



Botany — New System of Classification of Phsenogamia, van Tieghem, 79. 



Miscellaneous Scientific Intelligence — Cause of Secondary Undulations Registered 

 on Tide Gauges, 82. — Zoological Bulletin, 83. 



Obituary— Alv an Graham Clark, 83. — Carl Remigius Fresenius, 84. 



