CONTENTS OF VOLUME XLVI. 



Number 271. 



Page 



Art. I. — Studies of the phenomena of Simultaneous Con- 

 trast-Color; and on a Photometer for measuring the 

 intensities of Lights of different Colors; by A. M. 

 Mater _ _ _ 1 



II. — Kehoeite, a new Phosphate from Galena, Lawrence Co., 



S. D.; by W. P. Headdex 22 



III. — Ammonium-Lead Halides; by H. L. Wells and W. 



R. Johnston 25 



IV. — Rubidium-Lead Halides, and a Summary of the Double 



Halides of Lead; by H. L. Wells. _ 34 



V. — The Galveston Deep Well; by E. T. Dumble and G. 



D. Harris ___ 38 



VI. — Iodometric Determination of the Nitrates; by H. 



Gruener 42 



VII. — Piedmontite and Scheelite from the Aucient Rhyolite 



of South Mountain, Pennsylvania ; by G. H. Williams 50 



VIII. — Cambrian and the Ozark Series; by G. C. Broad- 

 head _ _ _ 57 



IX.— One-Volt Standard Cell; by H. S. Carhart 60 



X. — Cross Roads Meteorite; by E. E. Howell 67 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Study of Chemical Reactions by means of the Refractive 

 Index, Fery: Preparation of Chlorine by means of Nitric Acid and Manganese 

 dioxide, Lunge and Pret, 68.— Complex Acids containing Septivalent Iodine. 

 Blomstrand: Refractive Indices of liquid Oxygen, Nitrogen Monoxide and 

 Ethylene, and on the Spectrum of liquid Oxygen, Liveing und Dewar, 69. — 

 Production of Hydrogen Peroxide in the Electrolysis of Sulphuric acid, Kuri- 

 loff: Preparation of Pure Phosphoric oxide, Shexstone and Beck, 70.— Con- 

 stitution of Hydroxy lamine, Kolotoff, 71. — Chromophotograph, M. Marey : 

 Reflection of Electrical Waves at the extremity of a linear Conductor, Birke- 

 land : Electrical waves and light waves, V. Bjerknes : New' Electrometers, 

 Bjerknes, 72. — Magnetic Properties of liquid Oxygen: Specific Heat of Liquid 

 Ammonia, 7:-!. — Value of the meter in English inches, C. B. Comstock : Labora- 

 tory Course in Physical Measurements, W. C. Sabine, 74. 



Geology and Mineralogy — Tertiary Revolution in the Topography of the Pacific 

 Coast, J. S. Diller, 74. — Urnatella gracilis, C. B. Davenport: Lehrbuch der 

 geologischen Formations-Kunde. Kayser: Mineral Resources of the U. S., 75. 

 — Mineralogie de la France. A. Lacroix: Sodalite-syenite from Montana, Lind- 

 gren; and Melville: Summary of Progress in Mineralogy and Petrography 

 in 1892, "W. S. Bayley: Australian Meteorite, 76. 



Botany — Plants of Orizaba: Die naturlichen Pflanzenfamilien, 76. — Rainfall and 

 Leaf- form: Turgescence and transpiration in fleshy plants, E. Aubert: Origin 

 of Endogens from Exogens, G-. Hexslow, 77. 



Miscellaneous Scientific Intelligence — American Association for the Advance- 

 ment of Science. 78. — Australasian Association for the Advancement of Sci- 

 ence: British Association: Owen Memorial: Die Fortentwicklung der elec- 

 trischen Eisenbahn-Kinrichtungen, L. Kohlfurst, 79. — Gravity Research, 

 Determinations of Gravity with half -second Pendulums, T. C. Mendenhall: 

 Colors of Cloudy Condensation, C. Bares: Outlines of Forestry, Houston: 

 Naples Zoological Station : Krantz's Catalogue of Rocks: Manual of Machine 

 Drawing. Low and Blvis: Hawks and Owls of the U. S., Fisher, 80. 



