CONTENTS. 



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, Zsigmondt: Explosion of Mixtures of Methane and Air by the Electric 

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

 Chloride and Acetylene, Chayastelon: 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 placedria-4he 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 du 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. y 



Botany and Zoology — Symbolic Antillanae seu Fundamenta Florae India 3 Occiden- 

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

 function, C. R. Barxes, 244. — Rhoclora: Journal of the New Engkmd Botani- 

 cal Club, 245 — Catalogue of the Lepidoptera Phala9na3 in the British Museum, 

 Vol. I, Syntoinidae, G. F. Hampson, 24 6. 



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

 Smithsonian Institution, for the year ending June 30th, 1898,24 6. — Physical 

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

 Museum, 248. 



ry— Louis W. Peck, 248. 



