CONTENTS. Vll 



NuiTiber 185. 



Art. XXX. — Melting Points of Minerals in the Light of 

 Recent Investigations on the Gas Thermometer ; by A. 

 L. Day and R. B. Sosman - 341 



XXXI. — Separation of Cerium by Potassium Permanganate ; 



by E. J. Roberts - -- 350 



XXXII. — New Paleozoic Insects from the Vicinity of Mazon 



Creek, Illinois ; by A. Handliesch 353 



XXXIII. — New Family of Reptiles from the Permian of 



New Mexico; by S. W. Williston 378 



XXXIV. — New Elasmobranchs from Solenhofen in the Car- 

 negie Museum ; by C. R. Eastman. (With Plates I-III) 399 



XXXV. — Contributions to the Geology of New Hampshire, 

 No. V; Petrography of Tripyramid Mountain ; by L. V. 

 Piesson -. 405 



XXXVI. — Occurrence of Struverite ; by F. L. Hess and 



R. C. Wells... 432 



XXXVII. — Geologic and Petrographic Notes on the Region 



about Caicara, Venezuela ; by T. A. Bendrat 443 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Researches on Polonium, Mdme. Curie and A. 

 Debierne, 453. — Introduction to General Chemistry, J. T. Stoddard : Die 

 Beziehungen zwischen Farbe und Konstitution bei organischen Verbin- 

 dungen, H. Ley, 454. — Rays of Positive Electricity, J. J. Thomson, 455. — 

 Focal Isolation of Long Heat -Waves, Rubens and Wood, 456. — A Method 

 of Calibrating Fine Capillary Tubes, T. R. Merton, 457. — An Intro- 

 duction to Thermodynamics for Engineering Students, John Mills, 458. 



Geology and Mineralogy — Denudation and Erosion in the Southern Appa- 

 lachian Region, L. C. Glenn, 458. — Preliminary Notes on the "Chazy" 

 Formation in the Vicinity of Ottawa, P. E. Raymond, 459. — Die Fauna der 

 Spiti-Schief er des Himalaya, ihr geologisches Alter und ihre Weltstellung, 

 V. Uhlig : Beitrage zur Geologie der Baren-Insel, Spitzbergens und des 

 Konig-Karl-Landes : Historical-Stratigraphical Review of the Silurian of 

 Sweden, Joh. Chr. Moberg, 460. — Geologisch-petrographisehe Studien in 

 der Patagonischen Cordillera, P. D. Quensel, 461. — TJeber einigige Japan- 

 ische Vulkane, I. Feiedlaender : Geological Survey of Ohio, 462. — Ele- 

 ments of Geology, Blackwelder and Barrows : A Remarkable Crystal of 

 Beryl, G. F. Kunz : The Mineralogy of Arizona, F. N. Guild, 463.— Notes 

 on a recent find of Zincite Crystals, A. H. Phillips, 464. 



Miscellaneous Scientific Intelligence — National Academy of Sciences, 465. — 

 Bulletin of the Seismological Society of America, 466. — Commercial 

 Geography, E. V. Robinson, 467. 



Obituary — S. F. Emmons, 467 : S. Calvin : J. M. Van Bemmelen : Mrs. 

 E. H. Richards : E. E. Howell, 468. 



