CONTENTS 



Page 



Art. XXV.— Glacial Lakes Newbeyry, Warren and Dana, 

 . in Central New York; by H. L. Fairohild. (With 



Plate VI) 249 



XXVI.— Rapid Method for the Determination ot the 



Amount of Soluble Mineral Matter in a Soil ; by T. H. 



Means ...- 264 



XXVII. — New Type of Telescope Objective especially 



adapted for Spectroscopic Use; by C. S. Hastings .__ . 267 

 XXVIII. — Phenocrysts of Intrusive Igneous Rocks ; by L. 



V. Pirsson 271 



XXIX.— Occurrence, Origin and Chemical Composition of 



Chromite; by J. H/Pratt 281 



XXX. — Influence of Hydrochloric Acid in Titrations by 



Sodium Thiosulphate, with special reference to the Esti- 

 mation of Selenious Acid; by J. T. Norton, Jr 287 



XXXI.— Rock-forming Biotites and Amphiboles; by H. W. 



Turner -- 294 



XXXII. — One little known and one hitherto unknown species 



of Saurocephalus; by O. P. Hay _.. 299 



XXXIII. — Some American Fossil Cvcads. Part II; by G. 



R. Wieland. (With Plate VII.) 305 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Luminous aud Chemical Energy, Berthelot, 309.— 

 Homogeneity of Helium, Ramsay and Traveks: Properties of Ozone, Laden- 

 burg, 310. — Preparation of Alkali Nitrites, Divers: Composition of American 

 Petroleum; Young: Electrical waves along wires, A. Sommerfeld, 311. — 

 Polarization and hysteresis in dielectrics, W. Schaufelberger : New method 

 of showing electric waves, A. Neugschwender: Separation of long waves of 

 heat by means of quartz prisms, H. Rubens and E. Asciikinass: Theory ot 

 conduction of electricity through gases by charged ions, J. J. Thomson: Hall 

 phenomenon and the theory of Lorentz. Poincare, 312. — Relation of the Sur- 

 face Tension and Specific Gravity of certain Aqueous Solutions to their State of 

 Ionization, E. H. Archibald: Cause of the Absence of Coloration in certain 

 Limpid Natural Waters, W. Spring. 313. — Text-Book of General Physics for 

 the use of Colleges and Scientific Schools, C. S. Hastings and F. E. Beach, 314. 



Geology and Mineralogy — New facts regarding Devonian Fishes, C. R. East- 

 man, 314. — Geological Sketch of San Clemente Island, W. S. T. Smith: Geol- 

 og}* of the Edwards plateau and Rio Grande plain, etc., R. T. Hill aDd T. W. 

 Vaugiian, 315. — South Dakota Geological Survey, Bulletin No. 2, J. E. Todd: 

 Crater Lake, Oregon, J. S. Diller: International Geological Congress: Inter- 

 national Geographical Congress, 316.— Funafuti, W. J. Sollas: Petrograph- 

 ical and Geological Investigations of certain Transvaal Norites, Gabbros, and 

 Pyroxenites, J. A. L. Henderson, 317. — Occurrence of Corundum, T. II. Hol- 

 land and "W". G. Miller, 318. — Minerals in Rock Sections, L. Mel. Luquer: 

 New Mineral Names, 319. 



Miscellaneous Scientific Intelligence — Benjamin Apthorp Gould Fund, 320. — An- 

 nual Report of the Board of Regents of the Smithsonian Institution for the 

 year ending June 30, 1896: Second Washington Catalogue of Stars, 321. — 

 Zoological Results based on material from New Britain, New Guinea, Loyalty 

 Island and elsewhere, collected during' the years 1895-97, A. "Willey: Select 

 Bibliography of Chemistry, 1492-1897, H. C. Bolton: Biological Laboratory,- 



