IV CONTENTS. 



Number 242. 



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. He adden _ _ _ 89 



Xllfo's. — Notes on the Geology of the Florida Phosphate De- 

 posits ; by 1ST. H. Daeton ■ _ 102 



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



Florida; by X. H. Darton _ 105 



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



Penfield _ _ 106 



XY. — Compressibility of Hot Water and its Solvent Action 



on Glass ; by Carl B arus _ 110 



XVI. — 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. Melville 138 



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



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

 saurs of Xorth America ; byO. C. Marsh. (Plates I-X.) 167 



SCIENTIFIC INTELLIGENCE. 



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

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

 Solutions, van't Hoff. 152. — Properties of Liquid Chlorine, Kneetsch: 

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

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

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

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

 tion, J. Sahulka, 155. — Electrical waves in open circuit, A. Elsas: 

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

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

 156. 



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 siliceous Sinter by the Vegetation of Hot Springs, 

 W. H. Weed, 158. — Geological Survey of Illinois, A. H. Worthed, 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. — Plantse Europese. Enumeratio systematica et synonymica plantarum 

 phanerogamicarum in Europa sponte . crescentium vel mere inquilinarum, K. 

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

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

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

 zu Samaroceltis. P. Faubert : Eine Notiz iiber das Verhalten der Chloro- 

 phyllbander in den Zygoten der Spirogyraarlen, V. Chmielevskt, 166. 



