IV CONTENTS. 



Num~ber 56. 



Page 

 Art. XII. — Rowland's new Method for measuring Electric 



Absorption, and Losses of Energy due to Hysteresis and 



Foucault Currents, and on the Detection of short Circuits 



in Coils ; by L. M. Potts i 91 



XIII. — New Jurassic Vertebrates; by W. C. Knight 115 



XIV. — Carnotite and Associated Vanadiferous Minerals in 

 Western Colorado ; by W. F. Hiixebrand and F. L. 

 Ransome 120 



XV. — Restoration of Stylonurus Lacoanus, a Giant Arthro- 

 pod from the Upper Devonian of the United States; by 

 C. E. Beecher. (With Plate 1.) 145 



XVI. — Iodometric Estimation of Arsenic Acid ; by F. A. 



Gooch and J. C. Morris 151 



XVII. — Notes on Preglacial Drainage in Michigan ; by E. 



H. Mudge 158 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics— ^Various forms of Sulphur, Brauns, Butschli: Diurnal 

 Variation of Atmospheric Electricity, A.-B. Chatjveau, 161. — Lehrbuch der 

 Photochromie (Photographie der naturlichen Farben), W. Zenker, 162. — Joint 

 Transmission of Direct and Alternating Currents, F. Bedell, 163. 



Geology and Mineralogy — Geology of the Narragausett Basin, N. S. Shaler, J. B. 

 Woodworth and A. F. Foerste, 163. — View of the Carboniferous Fauna of 

 the Narragansett Basin, A. S. Packard, 164. — Geological Survey of Canada. 

 Summary Report of the Geological Survey Department for the year 1899, 165. 

 — Fossil Flora of the Lower Coal Measures of Missouri, D. "White, 166. — 

 La Face de la Terre (Das Antlitz der Erde) E. Suess, 167. — Gneisses, Gabbro- 

 schists and associated Rocks of South western Minnesota, C. W". Hall: Notices 

 of some recently described Minerals, 168. 



Miscellaneous Scientific Intelligence — American Association for the Advancement of 

 Science: British Association for the Advancement of Science, 169. — Catalogues 

 of the Collections in the British Museum of Natural History: Norwegian 

 North-Atlantic Expedition, 1876-1878: The Grammar of Science, K. Pearson, 

 170. 



