tW Index XI-XX, now ready. Price SI. 00. 



CONTEN T 8 . 



Page 



Art. XIX. — Some Peculiarities of Rock-Weathering and 



Soil Formation in the Arid and Humid Regions ; bv E. 



W. IIlLGAHI) '.-. 261 



XX. — The Colorimetric Determination of Small Amounts of 



Gold ; by R. N. Maxson 270 



XXI. — Cobaltite in Northern Ontario ; by J. S. De Lury.. 275 

 XXII. — Wasatch and Wind River Primates ; by F. B. 



Loomis -- 277 



XXIII. — A New Occurrence of Pseudo-Leucite ; by C. W. 



Knight 286 



XXIV.— The Re-formation of Soda-Leucite ; by T. T. Read 



and C. W. Knight 294 



XXV. — Orotaxial Significance of Certain Unconformities ; 



by C. R. Ketes... -.- 296 



XXVI. — Some Phosphorescent Calcites from Fort Collins, 



Colo., and Joplin, Mo.; by W. P. Headden ._. 301 



XXVII. — On the Chromates of Csesiuni ; by F. R. Fraprie 309 

 XXVIII. — Descriptions of two remarkable new species of 



Goliath Beetle (Dynastes) from Dominican Island, 



Antilles ; by A. H. Veerill 317 



Professor Samuel Pierpont Langley 321 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Determination of Sulphur in Pyrites, Hintz and. 

 Weber, 324. — Determination of Grape Sugar : Boiling of Metals of the 

 Platinum Group, Moissan, 325. — Rapid Preparation of Hydriodic Acid, 

 Bodroux : Radio-activity of Polonium, Curie : Electrochemical Equivalent 

 of Silver, G. van Dijk : Electrolytic Coherer, Gundry, 326. — Ionization by 

 Rontgen and Cathode Rays, J. Herweg, 327. — Modern Theory of Physical 

 Phenomena : La Th^orie Moderne des Ph^nomenes Physique, A. Righi, 328. 



Geology and Mineralogy — Red Beds of Southwestern Colorado and their 

 Correlation, W. Cross and E. Howe, 328. — Annales de Paleontologie, 329. 

 — Arthrophycus and Daedalus of Burrow Origin, and Preliminary Note on 

 the Nature of Taonurus, C. J. Sarle : Echinoderma, F. A. Bather : Oste- 

 ology of Champsosaurus Cope, B. Brown, 330. — Maryland Geological Sur- 

 vey, Vol. V, 1905, W. B. Clark: Les Tremblements de Terre ; Ge'ogra- 

 phie Seismologique, F. de M. de Ballore, 331. — Copper Deposits of the 

 Clifton-Morenci District, Arizona, W. Lindgren, 332. 



Miscellaneous Scientific Intelligence — Contribution to the Oceanography of 

 the Pacific, J. M. Flint, 333. — Microscopy of Vegetable Foods, A. L. Win- 

 ton, 335. — Philippine Journal of Science, P. C. Freer : Guide to the 

 Invertebrates of the Synoptic Collection in the Boston Society of Natural 

 History, J. M. Arms Sheldon, 336. — Monograph of the Isopods of North 

 America ; Bulletin of the U. S. National Museum, No. 54, H. Richardson: 

 Account of the Crustacea of Norway, G. O. Sars : Birds of the Southern 

 Lesser Antilles, A. H. Clark : Additions to the Avifauna of Dominica, 

 A. H. Verrill : Beitrage zur chemischen Physiologie, F. Hofmeister, 337. 

 — Life and Matter; An Answer to Haeckel's "Riddle of the Universe," 

 O. Lodge: Joseph Leidy Memorial : Memorial to Prof. Ernest Abbe, 338. 



