CONTENTS. 



Page 



Art. I. — Alternating Electric Arc between a Ball and 



Point ; by E. L. Nichols 1 



II. — Deformation of the Algonquin Beach, and Birth of 



Lake Huron ; by J. W, Spencer . ..... 12 



III. — Decimal System of Measures of the Seventeenth Cen- 

 tury ; by J. H. Goee 22 



IV. — Clinton Oolitic Iron Ores; by A. F. Foeeste 28 



Y. — Effects of Pressure on Ice ; by R. W. Wood, Jr. 30 



VI. — Review of the Quaternary Era, with special reference 



to the Deposits of Flooded Rivers; by W. Upham 33 



VII. — Illuminating power of Flat Petroleum Flames in 



various azimuths ; by A. M. Mayer 52 



VIII. — Physical Properties of Hard-Rubber, or Vulcanite ; 



by A. M. Mayer 54 



IX. — Some remarkably developed Calcite Crystals ; by L. 



V. Pirsson _ 61 



X. — Appendix. — Horned Artiodactyle (Protoceras celer) from 



the Miocene; by O. C. Marsh _. 81 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — Relation between Capillary Phenomena and Molecular 

 Mass, Goldstein, 64. — -Relation between Heat of Fusion and Solubility, 

 Walker, 65. — Relation of Cupric chloride solutions to Heat, Reicher and van 

 Deventer: Heat of Combustion of Nitrogenous Animal Products, Berthelot 

 and Andre, 66. — Action of Zinc on dilute Sulphuric acid, Pullinger: New 

 Melting-point Apparatus, Christomanos : Chemistry, Organic and Inorganic, 

 68. — Electro-chemical Analysis : Sugar Analysis: Practical Inorganic Chemistry: 

 Velocity of Sound at very Low Temperatures : Wave-lengths of Electrical 

 Oscillations, H. K. Waitz, 69. — Heat of the Moon and Stars, C. V. Boys: 

 Foam, Lord Rayleigh : A photochronograph, M. Marey : Photographic 

 Sensitives, H. W. Yogel, TO. 



Geology and Natural History. — International Congress of Geologists, 71. — New 

 Types of Carboniferous Cockroaches from the Carboniferous Deposits of the 

 United States, etc., S. H. Scctdder: Bulletin from the Laboratories of Natural 

 History of the State University of Iowa, 72. — Ueber einige Lycopodiaceen aus 

 der Steinkohlenformation, etc., H. B. Geinitz: Prodromus Faunae Mediterranese 

 sive Descriptio Animalium Maris Mediterranei incolarum, etc., J. V. Carus : 

 Minerals from Snake Hill, New Jersey, E. W. Perry': Silva of North America, 

 by C. S. Sargent, illustrated from drawings by C. E. Faxon, 73. — Recherches 

 anatomiques sur les hybrides, M. Brandza, 74. 



Astronomy. — Catalogue of Radiant Points of Shooting Stars, 75. — Washington 

 Observations for 1885 : List of Observatories and Astronomers, A. Lancaster: 

 Astronomical Papers prepared for the use of the American Ephemeris and 

 Nautical Almanac: Publications of the Washburn Observatory: Terrestrial 

 Magnetism, F. H. Bigelow, 76. 



Miscellaneous Scientific Intelligence. — Mexican Meteorites, 79. — Kilauea: University 

 Studies: Gesammelte Mathematische Abhandlungen, H. A. Schwarz, 80. 



Index to Volumes XXXI-XL: Extra number ready January 5, 1891, 

 price seven t} 7 - five cents. 



