VI CONTENTS. 



Num'b.er 232. 



Page 



Art. XXXI. — iEolian Sandstones of Fernando de Noronha; 



by J. C. Branner _.. __ 247 



XXXII. — Mountain Study of the Spectrum of Aqueous 



Vapor; by C. S. Cook 258 



XXXIIL— Occurrence of Basalt Dikes in the Upper Paleo- 

 zoic series in Central Appalachian Virginia ; by N. H. 



Darton. With notes on the Petrography ; by J. S. 



Diller .* 26£ 



XXXIV. — Additional Notes on the Tyrolite from Utah ; 



by W. F. Hillebrand and E. S. Dana 271 



XXXV. — Origin of the Soda-Granite and Quartz-Kerato- 



phyre of Pigeon Point ; by W. S. Bayley „.._. 273 



XXXVI.— Recent Contributions to Dynamical Meteorology ; 



by F. Waldo _ _ _ 280 



XXXVII. — Two Methods for the Direct Determination of 



Chlorine in Mixtures of Alkaline Chlorides and Iodides ; 



by F. A. Gooch and F. W. Mar __. 29a 



XXXVIII. — Occurrence of Polycrase, or of an allied species, 



in both North and South Carolina ; by W. E. Hidden 



and J. B. Mackintosh 302 



XXXIX. — Origin of some Topographic Features of Central 



Texas ; by R. S. Tarr . 306 



XL. — Formation of Silver Silicate ; by J. D. Hawkins. 311 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Determination of Vapor Density below the Boiling 

 Point, Demuth and V. Meyer, 312. — Vapor-density of Aluminum Chloride, 

 Nilson and Pettersson, 313. — Combination of Potassium and Sodium with 

 Ammonia, Joannis : Preparation of Platinic fluoride, Moissan : Xylose or 

 Wood-sugar, a new Penta-glyeose, Wheeler and Tollens, 315. — Identity of 

 Cerebrose with Galactose, Thierfelder : Dust in the Atmosphere, J. Aitkin : 

 The Sun's Heat, K. Angstrom, 316. — Method of rotating mirror, A. v. Oet- 

 tingen : Thermo-Electricity, DeCoudres : Measurement of Electrical Resis- 

 tances, Dr. Fetjssner, 317. 



Geology and Natural History — Subaerial decay of rocks and Origin of the Red 

 color of certain formations, I. C. Russell, 317. — Geologie de l'Ancienne 

 Columbie Bolivarienne, Venezuela, Nouvelle Grenade et Ecuador, H. Karsten, 

 319. — Fossil Sponges and Plants, W. Dawson: Emanations of carbonic acid r 

 sulphurous and other gases at "Death Gulch," Yellowstone Park, W. H. 

 Weed, 320. — Diatom beds and bogs of the Yellowstone National Park, W. H. 

 Weed: Archaean limestone and other rocks in Norfolk, Connecticut, R. H. Cor- 

 nish: Glacial scratches in the vicinity of Norfolk, Conn., R. H. Cornish: Mam- 

 malian Remains of Florida and elsewhere, J. Leidy, 321. — Joseph Willcox 

 on the identity of the modern Fulgur perversus with the Pliocene F. con- 

 trarius, 322. — Characteristics of Volcanoes, with Contributions of Facts and 

 Principles from the Hawaiian Islands* J. D. Dana, 323. — Geolological Record 

 for 1880-1884, W. T. and C. D. Sherborn : Tabellarische Uebersicht der 

 Mineralien nach ihren krystallographisch-chemischen Beziehungen geordnet, 

 P. Groth, 324. — New localities for Phenacite. W. S. Yeates: Hybrids in the 

 genus Ranunculus, 325. — Corals and Coral Islands, J. D. Dana, 326. 



Obituary — Eugene E. Deslongchamps : Melchior Neuhayr: Victor Ritter 

 von Zepharovich: F. von Quenstedt, 326. 



