CON T E N T S 



Page. 



Art. XVI.— Asa Gray; by J. D. Dana 181 



XVII.— Calibration of an Electrometer ; by D. W. Shea ... 204 



XVIII.— On the so-called Northford, Maine, Meteorite ; by 



F. C. Robinson .- 212 



XIX. — History of the Changes in the Mt. Loa Craters ; by 



James D. Dana. . . - 213 



XX. — The Taconic System of Emmons, and the use of the 

 name Taconic in Geologic nomenclature ; by Chas. D. 

 Walcott, of the U. S. Geological Survey 229 



XXI. — On the crystalline form of Polianite ; by Edward S. 



Dana and Samuel L. Penfield 243 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Stalagrnorneter and its use in quantitative analysis, 

 Traube. 248. — Apantlesis, a Separation of the Constituents of a Solution by 

 Rise of Temperature, Mallet : Properties of Fluorine, Moissan, 249. — Oxygen 

 Carriers, Lothar Meter: Atomic Weight of Ziuc, Reynolds and Ramsay, 

 250. — Text-book of Inorganic Chemistry, Victor von Richter, Edgar F. 

 Sjjith: Manual of Analytical Chemistry, John Mtttkr: New instrument for 

 measuring heat, Weber, 251. — Velocity of Sound, A. W. Rucker: Transmis- 

 sion of power by alternating electrical currents, T. H. Blakesley : Measurement 

 of Electromotive Forces, William Thomson: Influence of Magnetism on the 

 Thermo-electric behavior of Bismuth, Giovanni Pietro Grimaldi: Coincidences 

 between lines of different Spectra, 252 — Influence of thickness and luminosity 

 of light-producing layers, upon the character of Spectra, Ebert: Measurement 

 of force of gravitation, M. Defforges : Influence of temperature on Magnetiza- 

 tion, 253. 



Geology and Mineralogy — Note respecting the term Agnotozoic, T. C. Chamber- 

 lin, 254. — Contributions to the Paleontology of Brazil, Charles A. White: 

 Arkansas Geological Survey : Fossils of Littleton, New Hampshire : Palaeo- 

 lithic Man in Northwest Middlesex, J. A. Brown, 255. — Organization of the 

 Fossil Plants of the Coal Measures, W. C. Williamson : Catalogue of the Fos- 

 sil Mammalia in the British Museum, R. Lydekker: Geological Evidences of 

 Evolution, A. Heilprin, 256. — Kilauea: Allgemeine und chemische Geologie, 

 J. Roth: Mineral Resources of the United States. D. T. Day Native Plat- 

 inum from Canada, G. C. Hoffmann, 257. — Shepard Collection of Minerals: 

 Natural Gas, 258. 



Botany — Respiratory Organs of Plants, L. Jost: Combination of the Auxanome- 

 ter with the Clinostat, Albrecht, 258. — Die natiirlichen Pnanzenfamilien, A. 

 Engler and K. Prantl, 259. — Botanical Necrology for the year 1887, 260. 



Miscellaneous Scientific Intelligence — Hann's Meteorological Atlas, 263. — New 

 Meteorites, 264. 



