CONTENTS. 



Nurriber 27. 



Page 



Art. XXII. — Geothermal Data from Deep Artesian Wells in 



the Dakotas ; by N. H. Darton _ - 161 



XXIII. — Series of Transition Beds from the Comanche to 

 the Dakota Cretaceous in Southwest Kansas ; by C. N. 

 Gould . 169 



XXIV. — Examination of some Triclinic Minerals by means 



of Etching Figures ; by T. L. Walker 176 



XXV. — Some new Jurassic Vertebrates from Wyoming ; by 



W. C. Knight _. 186 



XXVI. — Accessory Elements of Itacolumite, and the Secon- 

 dary Enlargement of Tourmaline; by O. A. Derby 187 



XXVII. — Auriferous Conglomerate of the Transvaal ; by G. 



F. Becker 193 



XXVIII. — Estimation of Manganese as the Sulphate and as 



the Oxide ; by F. A. Gooch and M. Austin 209 



XXIX. — Spectroscope without Prisms or Gratings; by A. 



A. Michelson .__ 215 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Electrochemical method for changing an Alternating into 

 a Direct Current, Graetz: Electrochemical Equivalent of Carbon, Coehn, 218. 

 — Use of the Copper Voltameter, Foerster, 219. — Commencement of the Com- 

 bination of Hydrogen with Oxygen, Berthelot : Different Varieties of Carbon 

 (Amorphous, Graphite, Diamond), Moissan, 220. — Wissenschaftlichen Grund- 

 lagen der Analytischen Chemie, W. Ostwald, 221. — Lehrbuch der Allgemeinen 

 Chemie, W. Ostwald: Inorganic Chemical Preparations, F. EL Thorp: Experi- 

 mental Physics, W. A. Stone: Physical Experiments, A. P. Gage: Transmis- 

 sion of Radiant Heat by Gases at Varying Pressures, C. L. Brush, 222. — Con- 

 ductivity of Carbon for Heat and Electricity, L. Cellier: Determination of 

 Relative Heat Conductivity by the Isothermal Method. W. Voigt : Rontgen's 

 Original Papers on the Rontgen Rays, Rontgen, 223. — Johanniskafer Light, H. 

 Murtjoka : Occlusion of Hydrogen and Oxygen by Palladium, L. Mond, W. 

 Ramsay and J. Shields. 224. — Refractivities of Air, Oxygen. Nitrogen. Argon, 

 Hydrogen and Helium, Ramsay and Travers, 227. — Experiments with some 

 Electrochemical Actinometers, Rigollot, 228. 



Geology and Natural History — Earth Movement, C R. Van Hise, 230. — Geology 

 of Massanutten Mountain in Virginia, A. C. Spencer, 231. — Geological Survey 

 of Canada, G. M. Dawson: Geological sections from Moscow to Siberia and 

 return, P. Frazer: Note on the u Florencia Formation," H. A. Pilsbry, 232. — 

 Geology of Franz Joseph Land, 233. — Remarkable occurrence of xenotime, G. 

 C. Hoffmann : Crystalline Structure of Gold and Platinum Nuggets and Gold 

 Ingots, 235. — Flora of Franz Josef Archipelago, H. Fisher, 236. 



Miscellaneous Scientific Intelligence — International Congress of Zoology, 1898, 238. 

 — Report of S. P. Langley, Secretary of the Smithsonian Institution, for the 

 year ending June 30, 1897, 239. — Studies from the Yale Psychological Labora- 

 tory : The Sylvester Medal : Floods of the Mississippi River, 240. 



