CONTENTS. 



Page. 



Art. XIX. — Some Determinations of the Energy of the 



Light from Incandescent Lamps ; by Ernest Merritt. 167 



XX. — Geology of Fernando de Noronha. Part II; Petrog- 

 raphy ; by George H. Williams 178 



XXL — Op hiolite of Thnrman, Warren Co., N. Y., with re- 

 marks on the Eozoon Canadense ; by Geo. P. Merrill 189 



XXII. — Origin of the deep troughs of the Oceanic depres- 

 sion : Are any of Volcanic origin ? by James D. Dana, 

 with a bathymetric map, Plate VII 192 



XXIII. — Description of a problematic organism from the 



Devonian at the Falls of the Ohio ; by F. H. Knowlton 202 



XXIV. — Some curiously developed pyrite crystals from 



French Creek, Delaware Co., Pa.; by S. L. Penfield 209 



XXV. — Crystallized Bertrandite from Stoneham, Me., and 



Mt. Antero, Colorado; by S. L. Penfield 213 



XXVI. — Mineralogical Notes ; by J. S. Diller 216 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — Determination of molecular mass by means of vapor 

 pressure, Raoult, 221. — Method of avoiding "Bumping-" in Distillation, Mar- 

 kownikoff: Thiophosphoryl fluoride, Thorpe and Rodger, 222. — Relation 

 between the Absorption-spectra of Organic Compounds and their Chemical 

 Composition, Kruss, 223.-Absorption-Spectrum of Oxygen, Liveing and Dewar: 

 Spectrum of Oxygen at high altitudes, 224. — Compressibility of Oxygen, Nitro- 

 gen and Hydrogen, Amagat: Heat of Vaporization of Volatile Liquids, Chap- 

 puis: Combination of Oxygen and Nitrogen in Gaseous Explosions, Veith, 225. 

 — Dissipation of Fog by Electricity, Soret : Magnetization of iron and other 

 magnetic metals, Ewing and Low: Figures produced by electric action on 

 photographic plates, Brown, 226. — Spectrum of Cyanogen and Carbon, Vogel: 

 Determination of the focal length of a lens for different colors, Hasselberg, 

 Electrodynamic "Waves, Hertz, 227. — Resistance of electrolytes, Thomson, 228. 

 — Orthochromatic Photography, H. W. Vogel: Voltaic Balance, 229. 



Geology and Mineralogy. — Fossil Plants of the Coal-measures of Rhode Island, 

 L. Lesquereux, 229. — History of Volcanic Action during the Tertiary Period 

 in the British Isles, A. Geikie, 230. — Geological and Natural History Survey of 

 Minnesota, N. H. Winchell and W. Upham, 231. — Geological Survey of Ken- 

 tucky, J. R. Procter: Geology of New Jersey, G. H. Cook, 232. — Woodham 

 Artesian Well, E. Lewis, Jr. : Bowlder-Glaciation, H. Miller, 233. — Archseo- 

 cyathus of Billings, G. J. Hindb : Analyses of waters of the Yellowstone Na- 

 tional Park, F. A. Gooch and J. E. Whitfield, 234. — Elemente der Palaonto- 

 logie, G. Steinmann and L. Doderlein: Die Stamme der Thierreichs, Neu- 

 matr: Fossil Cockroaches, S. H. Scudder: Visual area in the Trilobite, Pha- 

 cops rana, J. M. Clarke: Mineralogical Notes, E. F. Ayres, 235. — Barite from 

 Aspen, Colorado, J. F. Kemp, 236. — Serpentine of Montville, N. J., G. P. Mer- 

 rill: Slipping planes and lamellar twinning in Galena, W. CROSS: New York 

 Minerals and their localities, F. L. Nason, 237. 



Botany and Zoology. — Certain relations of the cell-wall, Kohl: Chemical nature 

 of assimilation, T. Bokorny, 237. — Improvement of the " races " of the Sugar 

 Beet, C. Viollette and F. Desprez : Primordial leaves of Abietineas, Daguil- 

 lon, 238. — Notes on Cestoid Entozoa of Marine Fishes, E. Linton, 239. 



Miscellaneous Scientific Intelligence. — Photographic Map of the Normal Solar Spec- 

 trum, 240. — Temparature record at Hilo, Hawaii ; A short Account of the His. 

 tory of Mathematics, W. W. R. Ball, 241. — National Geographic Magazine : 

 Bathymetric Map, Plate VII: Soaps and Candles, J. Cameron, 242. 



