vi CONTENTS. 



Number 238. 



Page 



Art. XXXV. — Description of the " Bernardston Series " of 



Metamorphic Upper Devonian Rocks ; by B. K. Emerson 263 



XXXVI. — Circular Polarization of certain Tartrate Solu- 

 tions — III ; by J. H. Long . . 275 



XXXVII. — Rapid method for the Detection of Iodine, Bro- 

 mine, and Chlorine in presence of one another ; by F. A. 

 Gooch and F. T. Brooks 283 



XXXVIII. — Metacinnabarite from New Almaden, Califor- 

 nia ; by W. H. Melville 291 



XXXIX. — Keokuk Beds at Keokuk, Iowa ; by C. H. Gordon 295 



XL. — Note on the vapor-tension of Sulphuric Acid, with the 

 description of an accurate Cathetometer Microscope ; by 

 C. A. Perkins 301 



XLI. — Experiments upon the Constitution of the Natural 



Silicates ; by F. W. Clarke and E. A. Schneider 303 



XLII. — Five new American Meteorites; by G. F. Kunz 312 



XLIII. — Determination of the coefficient of cubical expansion 

 of a solid from the observation of the temperature at 

 which water, in a vessel made of this solid, has the same 

 apparent volume as it has at 0° C. ; and on the coefficient 

 of cubical expansion of a substance determined by means 

 of a hydrometer made of this substance; by A. M. Mater 323 



SCIENTIFIC INTELLIGENCE. 



Physics. — Steam Calorimeter, K. Wirtz, 329. — Mountain Magnetometer, 0. E. 

 Meyer : Velocity of Transmission of Electric Disturbances, J. J. Thomson : 

 Phosphoro-photographs of the ultra red, E. Lohmel, 330. — Photography of 

 Oscillating Electric Sparks, Boys: Electrical Discharges in MagDetic Fields, 

 M. A. Witz: Molecular Theory of Induced Magnetism, Ewing: Elements of 

 Laboratory Work, A. G. Earl, 331. 



Geology and Mineralogy. — Notes on the meeting of the Geological Society of 

 America at Indianapolis, 332. — Making of Icebergs, H. B. Loomis, 333. — 

 Sandstone dikes in California, J. S. Diller : Annual Report of the Director of 

 the U. S. Geological Survey for 1886-87 : Hawaiian volcanoes, W. T. Brigham, 

 334. — Brief notices of some recently described minerals, 335. 



Miscellaneous Scientific Intelligence. — American Association for the Advancement 

 of Science, 336. — British Association at Leeds : American Geological Railway 

 Guide, J. Macfarlane : Royal Society of N. S "Wales : Smithsonian Miscella- 

 neous Collections : Verzeichniss der Schriften iiber Zoologie von Dr. 0. 

 Taschenberg. of Halle, 312. 



