CONTENTS. 



Page 

 Art. XXX. — Radio-activity of Uranium Minerals; by B. B. 



Boltwood 269 



XXXI. — Heating Effects produced by Routgen Rays in 



Lead and Zinc ; by H. A. Bumstead 299 



XXXII. — Review of the Minerals Tungstite and Meyrnacite ; 



by T. L. Walker . . 305 



XXXIII. — Descriptions of Tertiary Insects ; by T. D. A. 



COCKERELL . ... ' " 309. 



XXXIV. — New Devonian Brachiopod Retaining the Origi- 

 nal Color Markings ; by D. K. Greger 313 



XXXV. — Method of Hibernation and Vegetative Reproduc- 

 tion in North American Species of Stellaria ; by T. Holm 315 



XXXVI. — Two New Boron Minerals of Contact-Metamorphic 



Origin ; by A. Knopf and W. T. Schaller . . 323 



XXXVII. —Determination of Vanadic and Molybdic Acids 



in the Presence of One Another ; by G. Edgar 332 



XXXVIII. — Constituents of Atmospheric Radio-activity ; 



by H. M. Dadouri an 335 



XXXIX. — Estimation of Iron b}^ Potassium Permanganate 



after Reduction with Titanous Sulphate ; by H. D. 



Newton.. 343 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Lithium in Kadio-active Minerals, McCoy : Radium 

 in the Earth, Steutt, 346. — Ionium, Maeckwald and Keetman : Sodium 

 Fluoride, Lacroix : Effect of Temperature on a Gold Leaf Electrometer, 

 Bottomley, 347. — Effect of a Magnetic Field on Ionized Air, Blanc : 

 Mechanical "Working of Canal Rays, Campbell Swinton : Velocity of Sound 

 in Fluids, Dorsing : Direction of Sound, Bowkler, 348. 



Geology — Research in China, Willis, Blackwelder. and Sargent, 349. — 

 Patuxent Folio, Shattuck, Miller, and Bibbins : Ouray Folio, Colorado, 

 Cross, Howe and Irving, 352. — Characteristics of the Glacial Period in 

 non-glaciated Regions, E. Huntington : Mauch Chunk Shale, J. Barrell : 

 Water Resources of the East St. Louis District, Bowman and Reeds, 353. — 

 Geol. Survey of Michigan : Geol. Survey of Wisconsin : Eai-thquakes, 

 Hobbs. 354. 



Paleobotany — Mesozoic Flowering Plants, Scott, 354. — Morphogenie der Spo- 

 rophylle, etc., Hallier, 355. — Pteridosperms and Angiosperms, Oliver : 

 Origin of Angiosperms, Arber, 356.— Vegetaux Fossiles, etc., Rene Zeil- 

 ler, 357. — Vegetaux Fossiles du Trieu de Leval, Marty : Plant remains in 

 Scottish Peat Mosses, Lewis : Cycadacese, Worsdell, 358. — Flora Fossile 

 de l'Argonne, Fliche : Paleobotanische Mittheilungen, Nathorst, 359. — 

 Trias und Jurapflanzen von Kotelny, Nathorst : Zamites and Pterophyl- 

 lum : Cycadophyta : Vegetaux Fossiles de Normandie, Lignier : Ginkgo- 

 vaxter, Nathorst : Taxoideae, Robertson, 360. 



Natural History — The Cahow in Bermuda, 361. — Principles of Breeding, 

 Davenport : Mechanismus und Vitalismus in der Biologie, 362. — Plant 

 Anatomy, Stevens : Lichtgenuss der Pflanzen, Wiesner, 363. — Chemie 

 der Hoheren Pilze, Zellner, 364. 



Miscellaneous Scientific Intelligence — Library of Congress : Metric and 

 British Systems of Weights, Measures and Coinage, F. M. Perkin, 364. 



