CONTEXTS 



Page 



Art. XI. — A Solution of the Aurora Problem ; by Frank 



H. Bigelow _ ___ 83 



XII. — Columbite and Tantalite from the Black Hills of 



South Dakota; by W. P. Headden 89 



XIIMs. — Notes on the Geology of the Florida Phosphate De- 

 posits ; by N. H. Darton 102 



XIII. — Record of a deep Well at Lake Worth, southern 



Florida; by N. H. Darton 105 



XIV. — Chemical Composition of Aurichalcite ; by S. L. 



Pexeield 106 



XV. — Compressibility of Hot Water and its Solvent Action 



on Glass ; by Carl Barus _ . 110 



XVL — Attempt to harmonize some apparently conflicting 

 Views of Lake Superior Stratigraphy ; by C. R. Van 

 Hise 117 



XVII. — Powellite — Calcium Molybdate: A new Mineral 



Species; by W. H. Melyille 138 



XVIII. — Bruckner's Klimaschwankungen ; by F. Waldo _. 141 



XIX. — Appendix. — Gigantic Ceratopsidse or horned Dino- 

 saurs of North America ; by O. C. Marsh. (Plates I-X.) 167 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — Law of Osmotic Pressure, Planck, 151. — Osmotic Ex- 

 periment, Nerxst: Determinations of Molecular Mass by means of Solid 

 Solutions, vax*t Hoff. 152. — Properties of Liquid Chlorine, Knletsch: 

 Preparation of Chromium by means of Magnesium, Glatzel, 153. — Production 

 of Urea from Albumin, Drechsel: Azoimide or Hydrazoic acid, Cuetics, 

 154. — New Method of obtaining the Compressibility and Dilatation of Gases, 



E. H. Amag-at: Mechanical equivalent of heat by method of heat radia- 

 tion, J. Sahulf^a, 155.— Electrical waves in open circuit, A. Elsas: 

 Electrical waves. Erxest Lecher: Electrical Gyroscope designed for recti- 

 fication of the mariner's Compass: Periodicity of the Aurora, M. A. Veeder, 

 156. 



Geology and Mineralogy. — Ninth Annual Report of the United States Geological 

 Survey to the Secretary of the Interior, 1887-88, J. W. Powell. 157.— Forma- 

 tion of Travertine and silicepus Sinter by the Vegetation of Hot Springs, 

 W. H. Weed. 158.— Geological Survey of Illinois, A. H. "YTorteen, 159.— 

 Geological Society of America : Geology of the Marquette Iron Region. T. B. 

 Brooks. 160. — Harmotome from the vicinity of Port Arthur, Ontario, W. 



F. Ferrier: Long Island Sound in the Quaternary Era, J. D. Dana, 161. 



Botany. — Neue Untersuchungen iiber den Bluthenanschluss, Karl Schumann", 

 162. — Plantas European Enumeratio systematica et synonymica plantarum 

 phanerogamicarum in Europa sponte crescentium vel mere inquilinarum, JL 

 Richter: Notes on Corticium Cakesii, B. & C, and Michanera Artocreas, 

 B. & C, G. J. Peirce, 163. — Recherches sur l'origine morphologique du Hber 

 interne, M. Lamouxette, 164. — Die Gattung Phyllostylon und ihre Beziehungen 

 zu Samaroceltis, P. F.4UBERT : Eine Notiz iiber. das VerhaltQn -der Chloro- 

 phyllbander in den Zygoteu der Spirogyraarlen. V. Chiiielevsky. 166. 



