VI CONTENTS. 



Number 28. 



Page 



Art. XXX. — The Bolometer; by S. P. Langley.. 241 



XXXI. — Temperature Coefficients of Certain Seasoned Hard 



Steel Magnets ; by A. Durwaed 245 



XXXII.— Skull of Amphictis ; 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 



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

 XXXVII. — Datoliie from Guanajuato; by O. C. Farrtng- 



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 and the Determination thereby of its Molecu- 

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

 Fritz, and Victor Meter, 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. Lockter, 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 Glyphioceratida?, J. P. Smith : Brief 

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

 Dr. C. Hintze: Ueber Alter, La gerungsform nnd Enstehungsart der Periadri- 

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

 dents, 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. Ppeffer, 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. Stehlin: 

 Transactions of the American Microscopical Society : Physikalisch-chemische 

 Propadeutik, H. Griesbach, 321. — Bibliography of the Metals of the Platinum 

 Group, J. L. Howe, 322. 



Obituary — William A. Rogers, 322. 



