CONTENTS. 



Number 39. 



Page 



Art. XVII. — Studies in the Cyperacese ; by T. Holm 171 



XVIII. — Granitic Breccias of Grizzly Peak, Col.; by G. H. 



Stone 184 



XIX. — Constitution of the Ammonium-Magnesium Phos- 

 phate of Analysis ; by F. A. Gooch and M. Austin.. 187 



XX. — Crystal Symmetry of the Minerals of the Mica Group ; 



by T. L. Walker 199 



XXI. — Descriptions of imperfectly known and new Actinians, 

 with critical notes on other species, IV; by A. E. Ver- 

 rill 205 



XXII. — Study of some American Fossil Cycads. Part I. 

 The Male Flower of Cycadeoidea ; by G. R. Wieland. 

 (With Plates II-IV.) 219 



XXIII. — Footprints of Jurassic Dinosaurs ; by O. C. Marsh. 



(With Plate V.) 229 



XXIV.— New Kansas Meteorite ; by H. L. Ward 233 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Density and Composition of Liquid Air, Ladenburg 

 and Krugel, 234. — Semi-Permeable Membranes, Mijers, 235. — Solution of 

 Platinum and Gold in Electrolytes, Margueles: Aqueous Solutions of Metallic 

 Gold, Zsigmondy: Explosion of Mixtures of Methane and Air by the Electric 

 Current, Couriot and Metjnier, 236. — Crystallized Compound of Cuprous 

 Chloride and Acetylene, Chavastelon: Matter, Energy. Force and "Work, S. 

 W. Holman, 237. — Uranium Radiation, and the Electrical Conduction produced 

 by it, Rutherford, 238. — Silver Voltameter and its use in determinations of 

 normal elements, K. Kahle: Absorption of light by a body placed in the mag- 

 netic field, Rhigi, 239. 



Geology and Mineralogy — Recent Earth Movement in the Great Lakes Region, 

 G. K. Gilbert, 239.— Petrology of Rockall Island. J. W. Judd, 241.— Recher- 

 ches geologiques et petrographiques sur. le massif da Mont Blanc, L. Duparo 

 and L. Mrazec: Native Silver in North Carolina, G. F. Kunz, 242. — Occurrence 

 of polycrase in Canada, G. C. Hoffmann: Kaolins and Fire Clays of Europe, 

 and the Clay- working Industry of the United States in 1897, H. Ries, 243. — 

 Origin of the Gases evolved on heating Mineral Substances, Meteorites, etc., M. 

 W. Travers, 244. 



Botany and Zoology — Symbohe Antillanse seu Fundamenta Floras India? Occiden- 

 talis, I. Urban: Plant life, considered with special reference to form and 

 function, C. R. Barnes, 244. — Rhodora: Journal of the New England Botani- 

 cal Club, 245 — Catalogue of the Lepidoptera Phalasnse in the British Museum, 

 Yol. I, Syntomidas, G. F. Hampson, 246. 



Miscellaneous Scientific Intelligence — Report of S. P. Langley, Secretary of the 

 Smithsonian Institution, for the year ending June 30th, 1898, 246. — Physical 

 Geography, W. M. Davis: Annual Report of the Director of the Field Colum- 

 bian Museum, 248. 



Obituary — Louis W. Peck, 248. 



