£3^ Index XI-XX, now ready. Price $1.00. 



CONTENTS. 



Page 



Art. XII. — Magnetic Field and Coronal Streamers; by J. 



Trowbridge . _ . - 189 



XIII. — Glaciation of Orford and Sutton Mountains, Quebec; 



by A. W. G. Wilsox 196 



XIV. — Drawing of Crystals from Stereographic and Gno- 



■monic Projections ; by S. L. Penfield . . — 206 



XV. — A Suggested Cause of Changes of Level in the Earth's 



Crust ; by O. Fisher '.. 216 



XVI. — North American Plesiosaurs ; by S. W. Williston 



(with Plates I-IV) 221 



XVII. — Occurrence of Sulphur and Celestite at Maybee, 



Michigan ; by E. H. Kraus and W. F. Hunt 237 



XVIII. — Local Predictions for the Total Eclipse of the Sun, 

 190*7, Jan. 13-14, in Turkestan and Mongolia ; by D. 

 Todd and R, II. Baker 245 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Silicon-fluoroforni, Buff and Albert : Decomposi- 

 tion of Ammonium Sulphate by Hot Sulphuric Acid in the Presence of 

 Platinum, Delepine, 247. — Determination of Tellurous and Telluric Acids, 

 Berg': Manganese as a Fertilizer for Plants, Bertrand : Conversations on 

 Chemistry, W. Ostwald, 248. — Experimental Electro-Chemistry. N. M. 

 Hopkins : Badiation from Ordinary Materials, N. B. Campbell : Spark 

 Potentials, M. Toepler, 249. — Measures of Radiation in relation to Resona- 

 tors in the Region of Short Electric Waves, M. Paetzold : Electrical Rec- 

 tifier, A. Wehnelt, 250. 



Geology and Mineralogy — United States Geological Survey, C. D. Walcott, 

 250. — U. S. Geological Survey; Recent Publications, *251. — Triassic Ceph- 

 alopod Genera of America, A. Hyatt and J. P. Smith : Miocene Fora- 

 minifera from the Monterey Shale of 'California, R. M, Bagg, Jr. : North 

 Carolina Geological Survey, J. H. Pratt and J. V. Lewis, 253. — Cancri- 

 nite-Syenite from Kuolajarvi, I. G. Sundell : Opal Pseudomorphs from 

 White Cliffs, New South Wales, C. Anderson and H. S. Jevons, 254.— 

 Physical Geography, Geology, Mineralogy and Paleontology of Essex 

 County, Massachusetts, J. H. Sears : Lead and Zinc Deposits of Virginia, 

 T. L. Watson : Asbestos : its Occurrence, Exploitation, and Uses, F. 

 Cirkel, 255. — Cobalt-Nickel Arsenides and Silver Deposits of Temiskam- 

 ing, W. G. Miller : Economic Geology of the United States, H. Ries, 256. 

 — Handbuch der Mineralogie, C. Hintze, 257. 



Miscellaneous Scientific Intelligence — Scientific Results of the Expedition to 

 the Eastern Tropical Pacific, 257. — Carnegie Institution of Washington, 

 258. — Report of Secretary of the Smithsonian Institution, S. P. Langlet : 

 Superintendent of the Coast and Geodetic Survey, O. H. Tittmann, 259. — 

 Publications of the United States Naval Observatory, C. M. Chester : 

 Bureau of American Ethnology: Bulletins of the United States National 

 Museum : Mazama : A Record of Mountaineering in the Pacific North- 

 west : Elementary Mechanics, G. A. Merrill, 260. 



