-^ 



VI CONTENTS. 



Number 244. 



Page 



Art. XXVIII. — Allotropic Silver ; by M. Carey Lea 259 



XXIX. — Phenomenon of Rifting in Granite ; by R. S. Tarr 267 

 XXX. — Redrock Sandstone of Marion County, Iowa ; by 



C. R. Ketes 273 



XXXI. — Volumetric Composition of Water ; by E. W. 



Morley 276 



XXXII. — Certain points in the Estimation of Barium as the 



Sulphate ; by F. W. Mar 288 



XXXIII. — Halotrichite or Feather Alum, from Pitkin Co., 



Colorado ; by E. H. S. Bailey 296 



XXXIV. — Xew Serpent from Iowa; by R. E. Call 297 



XXXV. — Crystallized Azurite from Arizona ; by O. C. 



Farringtox I 300 



XXXVI. — Occurrence of Xenotime as an accessory Element 



in Rocks ; by O. A. Derby _ 308 



XXXVII. — Magnetite Ore Districts of Jacupirauga and 



Ipanema, Sao Paulo, Brazil; by O. A. Derby . 311 



XXXVIII.— Pink Grossularite from Mexico ; by C. F. de 



Laxdero . _ . - 321 



XXXIX. — Appendix — Restoration of Triceratops ; by O. C. 



Marsh. (With Plates XV and XVI) 339 



XL. — Development of the Brachiopoda ; by C. E. Beecher. 



(With Plate XVII) 343 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — Determination of "Vapor-Pressures, Charpy : Yapor- 

 densities at low Temperatures, Kbatjse and Meyer, 323. — Dispersion of 

 Carbon Compounds, Barbier and Rotrx : Electrical Properties of Semi- 

 permeable Walls, Ostwald, 324. — Allotropic Silver, Praxge: Continuity of 

 Solid and Liquid, Carl Bares, 325. — Photoelectricity, G. M. Mlxchix : Pho- 

 tography of Colors, M. G. Lippmann, 326. — Pin-hole Photography, Rayleigh : 

 Lectures on the Electromagnet, S. P. Thompson, 327. 



Geology and Mineralogy. — Lake Bonneville, G. K. Gilbert, 327. — First Annual 

 Report of the Geological Survey of Texas, 1889, E. T. Dumble: Geological 

 Survey of Missouri, A. Wixslow, 329. — Geological Survey of Alabama: Cata- 

 logues of the British Museum, R. Lydekker : Fossil Insects of North America, 

 S. H. Scudder : Zittel's Handbuch der Palseontologie, Schimper and Schexk : 

 Monographie der baltischen Bernsteinbaume, H. Coxwextz, 330. — Ueber die 

 Fructification von Benettites Gibsonianus, H. Grafex zu Solms-Laubach: Die 

 fossile Flora von Schonegg bei Wies in Steiermark, Ettixgshausen, 331. — Das 

 australische Florenelement in Europa, Ettingshausex : Untersuchungen uber 

 Ontogenie und Phylogenie der Pflanzen auf palaontoiogische Grundlage, 

 Ettixgshaesex and Krasax : Analysis of Alaska Garnet. A. F. Kouxtze, 332. 



Botany. — West American Oaks, Greexe and Haxsex, 333. — On Isoetes lacustris, 

 J. B. Farmer: Studien uber die Tribus der Gaertnereen, H. Solereder, 334. 

 — Ueber die Yerbreitung der karpotropischen Nutations-krummungen der 

 Kelch-, Hull-, und ahnlicher Blatter und der Bliithenstiele.A. Hansgirg, 335. 

 — Missouri Botanical Garden, 336. 



Miscellaneous Scientific Intelligence. — Volcano of Kilauea, Hawaii, 336. — American 

 Association of Chemists: Audubon Monument, 337. 



Obituary. — Alexaxder Wixchell, 337. — Hexry Bowmax Brady, 338. 



