CONTENTS. 



Page 



Art. XXII. — Lower Silurian Fossils from a Limestone of the 



original Taconic of Emmons; by James D. Dana, 241 



XXIII— Preliminary Report, of S. W. Ford and W. B. 

 Dwight, upon fossils obtained in 1885 from Metamor- 

 phic Limestones of the Taconic Series of Emmons at 

 Canaan, N. Y. (With Plate VII) 248 



XXIV. — Surface Transmission of Electrical Discharges ; by 



H. S. Cakhart, ... 256 



XXV. — The Minerals of Litchfield, Maine ; by F. W. Clarke, 261 



XXVI. — Chemical Behavior of Iron in the Magnetic Field; 



by Edward L. Nichols, Ph.D., 272 



XXVII. — The Inculcation of Scientific Method by Example, 

 with an illustration drawn from the Quaternary Geology 

 of Utah ; by G. K. Gilbert. (With Plate VIII),..... 284 



XXVIII. — Nova Andromedse ; by Asaph Hall, 299 



XXIX. — Some New Forms of the Dinocerata; by W. B. 



Scott, .... 303 



SCIENTIFIC INTELLIGENCE. 



Chemistry. — Volatility of Sulphur and Mercury, Berthelot : Germanium, "Wink- 

 ler, 308. 



Geology and Mineralogy. — Geology of Natural Gas in Pennsylvania and New 

 York, C. A. Ashburxer, 309. — Existing- Glaciers in the United States, I. C. 

 Russell; Upper Miocene in Eastern Mexico, Cope: New Carboniferous 

 Arachnidan from Arkansas, S. H. Scudder, 310. — Revision of the Pakeocrinoi- 

 dea, C. Wachsmuth ;md F. Sprixger: Geology — Chemical, Physical and Strati- 

 graphical, J. Prestwich : Artificial minerals, xi de Schultex: Palaeontol- 

 ogy of New York, J. Hall, 311. 



Botany and Zoology. — Botanical Necrology for 1885, 312. — Drugs and Medicines 

 of North America, J. U. Lloyd and C. G. Lloyd, 313. — Leerboek der Planten- 

 physiologie, Hugo de Yries, 314. — Baillon's Dictionnaire de Botanique: Bail- 

 ion's Histoire des Plantes : Plants naturalized in the southwest of France, 315. 

 — Edward Tuckermax: Adaptation to an emergency in the Cicada septende- 

 cim, J. S. Newberry, 316. — -Bulletin of the Scientific Laboratories of Denison 

 University, C. L. Herrick: Evolution versus Involution, A. Z. Rred, 31*7. 



Astronomy. — Uranometria Nova Oxoniensis, C. Pritchard, 317.: — Nebulas in the 

 Pleiades : Relation of the Zodiacal Light to Jupiter, H. Geelmitydex : Relation 

 of Asteroid Orbits to those of Jupiter, Searle, 318. — Photographs of the Solar 

 Spectrum, H.A- Rowland, 319. 



Miscellaneous Scientific Intelligence. — Report of the International Polar Expedition 

 to Point Barrow, Alaska, 319. — Third Annual Report of the Bureau of Eth- 

 nology, J. W". Powell : Thermometer Exposure, H. A. Hazes : Wohler Me- 

 morial, 320. 



Obituary. — A. vox Lasaulx: Heixrich Fischer, 320. 



TEN-VOLUME INDEX. 



An extra number of this Journal, of fifty-six pages, containing 

 an Index to volumes xxi to xxx, was issued in January. This num- 

 ber is sent to those only who specially order it; the price is seventy- 

 five cents per copy. The index makes the closing part of vol. xxx. 



