CONTENTS. 



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

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

 XXX. — Redrock Sandstone of Marion County, Iowa 



C. R. Ketes.' \ 



XXXI. — Volumetric Composition of Water ; by E. 



Morlet 



XXXII.- — Certain points in the Estimation of Barium a 



Sulphate ; by F. W. Mar 



XXXIII. — Halotrichite or Feather Alum, from Pitkin 



Colorado ; by E. H. S. Bailey 



XXXIV. — New Serpent from Iowa ; by R. E. Call... 

 XXXV. — Crystallized Azurite from Arizona; by ( 



Farrixgton 



XXXVI. — Occurrence of Xenotime as an accessory El' 



in Rocks ; . by O. A, Derby 



XXXVII. — Magnetite Ore Districts of Jacupiraug 



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



XXXVIII. —Pink Grossularite from Mexico ; by C. 



Landero j. 



XXXIX. — Afpendix — Restoration of Triceratops ; by 



Marsh. (With Plates XV and XVI) ., 



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



(With Plate XVII) 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — Determination of Yapor-Pressures, Cha 

 densities at low Temperatures, Krause and Meyer, 323. — I 

 Carbon Compounds. Barbier and Roux : Electrical Properti< 

 permeable Walls, Ostwald. 324. — Allotropic Silver, Praxge: C 

 Solid and Liquid, Carl Barus, 325. — Photoelectricity, G. M. Mi* 

 tography of Colors. M. G. Lippmaxx, 326. — Pin-hole Photography 

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



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

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

 Survey of Missouri, A. TTinslow, 329. — Geological Survey of Ala 

 logues of the British Museum, R. Lydekker : Fossil Insects of No 

 S. H. Scudder : Zittel's Handbuch der Palseontologie. Schimper a 

 Monographic der baltischen Bernsteinbaume, H. Coxwextz, 330 

 Fructification von Benettites Gibsonianus, H. Grafen zu Solms-L 

 fossile Flora von Schotiegg bei Wies in Steiermark, Ettingshause 

 australische Florenelement in Europa, Ettingshausen: Untersu( 

 Ontogenie und Phylogenie der Pflanzen auf palaontologische 

 Ettixgshausex and Krasan : Analysis of Alaska Garnet. A. F. K 



Botany. — West American Oaks, Greene and Hansen, 333. — On Isoe 

 J. B. Farmer : Studien iiber die Tribus der Gaertnereen, H. Sol: 

 — Ueber die Verbreitung der karpotropischen Nutations-krurni 

 Kelch-, Hull-, und ahnlicher Blatter und der Bluthenstiele. A. Ha 

 — Missouri Botanical Garden. 336. 



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

 Association of Chemists: Audubon Monument, 337. 



Obituary. — Alexander Wixchell. 337. — Henry Bowman Brady. 3 



