viii CONTENTS. 



Number 144. 



Page 

 Art. XLI. — Internal Temperature Gradient of Metals ; by 



S. B. Serviss.- 451 



XLII. — Aggraded Terraces of the Rio Grande ; by C. R. 



Ketes 467 



XLIII.— Waterglass ; Part YI ; by J. M. Ordwat. 473 



XLIY. — Action of Dry Ammonia upon Ethyl Oxalate ; by 



I. K. Phelps, L. H. Weed and C. R. Housum 480 



XLY. — Note on Volcanic Activity ; by C. Barus . 483 



XLV I.— Artificial Hematite Crystals ; by C. E. Munroe.. 485 

 XLVII. — Anhydrite Twin from Aussee ; by F. Bascom and 



Y. GOLDSCHMIDT 487 



XL VIII. — Occurrence of Olivine in the Serpentine of Chester 



and Middlefield, Mass. ; by C. Palache 491 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Speculations in Regard to Atomic Weight Numbers, 

 H. Collins, 496. — Vapor-tension of Sulphur at Low Temperatures, H. 

 Greuner : Helium in Natural Gas, Cody and McFarland, 497. — Electro- 

 Analysis, E. F. Smith : Fizeau's Research on the Change of the Azimuth of 

 Polarization due to Movement of the Earth, 498. — Secondary Cathode Rays 

 Emitted by Substances Exposed to y-Rays, R. D. Kleeman : Secondary 

 Rontgen Radiators from Gases and Vapors, Barkla, Crowther : Abrupt 

 Limit of Distance in the Power of Positive Rays to Produce Phosphor- 

 escence, J. Kunz, 499. — Vacuum Bolometer, E. Warburg, G. Leithauser 

 and E. Johansen : Ratio of Electrical Units, E. B. Rosa and N. E. Dorset, 

 500. 



Geology amd Mineralogy — Geology of North Central Wisconsin, S Weid- 

 man, 500. — Research in China ; Petrography and Zoology, E. Black- 

 welder, 501. — Miscellanea Palasontologiea, A. Fritsch : Evidences of a 

 Coblenzian invasion in the Devonic of Eastern America, J. M. Clarke, 

 502. — The Geology of Islay, S. B. Wilkinson : Geology and. Water 

 Resources of the Bighorn Basin, Wyoming, A. Fisher : Geology of 

 the Guaynopita District, Chihuahua, a contribution to the knowledge of 

 the structure of the Western Sierra Madre of Mexico, E. O. Hovey, 503. — 



, Tertiary Mammal Hoi'izons of North America, F. Osborn, 504. — Gold 

 Nuggets from New Guinea, A. Liversidgej 505. 



Miscellaneous Scientific Intelligence — Annual Report of the Board of Regents 

 of the Smithsonian Institution, showing the Operations, Expenditures, 

 and Conditions of the Institution for the year ending June 30, 1906, 506 ; 

 National Academy of Sciences : American Association for the Advance- 

 ment of Science, 507 : Annual Report of the Board of Scientific Advice 

 for India for the year 1905-1906 : Mendelism, R. C. Ptjnnett : Les Prix 

 Nobel in 1904 : Memorials of Linnasus, 508. — Astronomical Observatory of 

 Harvard College : New York State Museum : Dew-ponds, Martin, 509. 

 Index to Volume XXIV, 510. 



