CONTENTS. 



Page 



Art. XXX .he Bolometer; by S. P. Langley 241 



XXXI. — Temperature Coefficients of Certain Seasoned Hard 



Steel Magnets ; by A. Duewaed 245 



XXXII.— Skull of Araphictis; by E. S. Riggs.- ----- 257 



XXXIII.— Condition of Oxidation of Manganese precipitated 



by the Chlorate Process ; by F, A. Gooch and M. 



Austin 260 



XXXIV.— San Angelo Meteorite; by H. L. Preston 269 



XXXV.— Pre-Glacial Decay of Rocks in Eastern Canada; 



bv R. Chalmers 273 



XXXVI— New Form of Make and Break; by C. T. Knipp 283 

 XXXVII.— Datolite from Guanajuato; by O. C. Farring- 



ton .--- 285 



XXXIX. — Clinohedrite, a new mineral from Franklin, N. J.; 



by S. L. Penfield and H. W. Foote . . - 289 



XL. — Rhodolite, a new variety of garnet ; by W. E. Hidden 



and J. H. Pratt 294 



SCIENTIFIC INTELLIGENCE. . 



Chemistry and Physics — Solubilities of Liquids, Aignan and Dugas: Thermody- 

 namics of the Swelling of Starch aud the Determination thereby of its Molecu- 

 lar Mass, Rodewald, 297. — Evolution of Oxygen duriog Reduction, Frenzel,. 

 Fritz, and Victor Meyer, 298. — Chromium Tetroxide and Perchromates, 

 Wiede: Potassium Percarbonate, Von Hansen, 299. — Formation of Natural 

 Petroleum and the Spontaneous Polymerization of Hydrocarbons, Engler : 

 Sun's Place in Nature. Sir N. Lockzer, 300. — Nature of Rontgen Rays, Stokes : 

 Impulse theory of X-rays, J. J. Thomson, 301. — Acoustic phenomena in the 

 Electric Arc, Simon: Time of vibration of very high notes: Electrical excita- 

 tion: Manual of Experiments in Physics; Laboratory Instruction for college 

 classes, J. S. Ames and W. J. A. Bliss, 302. 



Geology and Mineralogy — Recent Publications of the U. S. Geological Survey, 303. 

 — Gold Fields of Alaska. 305. — Geological nomenclature, 313. — Development 

 of Glyphioceras and the Phylogeny of the Glyphioceratidre, J. P. Smith: Brief 

 notices of some recently described minerals, 315. — Handbuch der Mineralogie, 

 Dr. C. Hintze: Ueber Alter, Lagerungsform und Enstehungsart der Periadri- 

 alischen granitkornigen Massen, Dr. W. Salomon, 316. — Petrology for Stu- 

 dent?, an introduction to the study of rocks under the microscope, A. Harker, 

 317. 



Botany and Zoology — Pflanzenphysiologie ; Handbuch der Lehre vom Stoffwech- 

 sel und Kraftwechsel in der Planze, Dr. W. Pfeffer, 317. — -Permeability of 

 the bark of tree-trunks to atmospheric gases, H. Devaux: Lessons with 

 Plants ; Suggestions for Seeing and Interpreting some of the Common Forms of 

 Vegetation, L. H. Bailey, 318. —Catalogue of the Madreporarian Corals in the 

 British Museum, H. M. Bernard: Text-book of Zoology, T. J. Parker and W. 

 A. Haswell, 319. 



Miscellaneous Scientific Intelligence— United States Coast and Geodetic Survey: 

 Annals of the Astronomical Observatory of Harvard College, 320.— L. Riiti- 

 meyer-gesammelte kleine Schriften allgemeinen Inhalts aus dem Gebiete der 

 Naturwissenschaft nebst einer autobiographischen Skizze, H. G. Steiilin: 

 Transactions of the American Microscopical Society : Physikalisch-chemische 

 Propadeutik, 11. Grlesba.ch, 321.— Bibliography of the Metals of the Platinum 

 Group, J. L. Howe, 322. 



Obituary — William A. Rogers, 322. 



