CONTENTS. Vll 



Number 149. 



Art. XL. — Ionium, a New Radio-active Element ; by B. B. 



Boltwood 365 



XLI. — Mid-Cretaceous Species of Torreya ; by E. W. Berry 382 



XLII. — Cranial Musculature and the Origin of the Frill in 

 the Ceratopsian Dinosaurs ; by R. S. Lull. (With 

 Plates I-III.) /_ - 387 



XL1II. — Desiccation Conglomerates in the Coal-measures 



Limestone of Ohio ; by J. E. Hyde . 400 



XLIV.— Behavior of Nuclei of Pure Water ; by C. Bartts. 409 



XL V*— Relations between the Meteorological Elements of 

 the United States and the Solar Radiation ; by F. H. 

 Bigelow - 413 



XL VI. — Lower Paleozoic Stratigraphy of Southwestern Illi- 

 nois ; by T. E. Savage 431 



XLVII. — Separation of Magnesium from the Alkalies by 

 Alcoholic Ammonium Carbonate ; by F. A. Gooch and 

 E. A. Eddy ... 444 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Determination of Small Amounts of Iron in Copper 

 Alloys, A. W. Gregory : Action of Carbonates upon Tetrathionates, A. 

 Gutmann, 449. — Percarbonates, Wolffenstein and Peltner : Practical 

 Methods for the Iron and Steel Works Chemist, J. K. Heess : Laboratory 

 Exercises in Physical Chemistry, F. H. Getman : Quantitative Chemical 

 Analyses, A. F. Gilman : Flame Spectra obtained by Electrical Means, 

 G. A. Hemsalech and C. de Watteville, 450. — Electric Furnace Reac- 

 tions under High Pressure, R. S. Hutton and J. E. Petavel : Positive 

 Column in Oxygen, P. J. Kirby : Quadrant Electrometers, H. Schulze : 

 Reception of Electric Waves in Wireless Telegraphy, Reinhold-Ruden- 

 berg : Velocity of Sound, M. Thiesen : Diffraction of X-rays, B. Walter 

 and R. Pohl, 451.— Electrolitic Rectification of Niobium, G. Schulze : 

 A Manual of Practical Physics, E. S. Ferry and A. T. Jones : La Tele- 

 graphie sans Fil, I. Van Dam, 452. 



Geology — Shepard on the Underground Waters of Missouri, C. A. Davis, 

 452. — Falls of the Niagara, J. W. W. Spencer, 455. — Michigan State Geo- 

 logical Survey, A. C. Lane, 456. — Illinois State Geological Map, Stuart 

 Weller : North Dakota Geological Survey, A. G. Leonard : Sur la Fixa- 

 tion des Coquilles de quelques Strophomenacea, N. Yakovlew, 457.— 

 The Data of Geochemistry, F. W. Clarke, 458. 



Miscellaneous Scientific Intelligence — National Academy of Sciences, 458. — ■ 

 Report of the Superintendent of the Coast and Geodetic Survey, 0. A. 

 Tittmann, 459. — Harvard College Observatory, E. 0. Pickering : Publica- 

 tions of the Allegheny Observatory of the Western University of Pennsyl- 

 vania, F. Schlesinger : Darwin Celebration at Cambridge, 4t!0. 



