VI CONTENTS. 



Number 214. 



Page 



Art. XXII. — A young Tortoise, Chrysemys picta, with two 



heads ; by E. H. Barbour. With Plate V 227 



XXIII.— The Structure of Florida; by L. C. Johnson 230 



XXIY. — Analysis of a Soil from Washington Territory, and 

 some remarks on the utility of Soil-analysis ; by E. A. 

 Schneider 236 



XXV. — Rosetown Extension of the Cortlandt Series; by J. 



F. Kemp 247 



XXYI. — The Contact-Metamorphism produced in the ad- 

 joining Mica schists and Limestones by the Massive 

 Rocks of the " Cortlandt Series," near Peekskill, N. T.; 

 by G. H. Williams. With Plate VI L 254 



XXVIL— The Sedentary Habits of Platyceras; by C. R. 



Ketes 269 



XXVIII. — Edisonite, a fourth form of Titanic acid; by W. 



E. Hidden 272 



XXIX. — Two new masses of Meteoric Iron ; by G. F. Kttnz. 



With Plate VII 215 



XXX. — Experiments on the Effect of Magnetic Force on the 

 Equipotential Lines of an Electric Current; by E. H. 

 Hall 277 



XXXI. — The Compression of Powdered Solids; by W. 



Spring . 286 



XXXII. — Preliminary notice of Beryllonite, a new mineral ; 



by E. S. Dana 290 



SCIENTIFIC INTELLIGENCE. 



Physics. — Infra-red Solar Spectrum, Abney, 291. — Photometry of Color, Abney: 

 Heat Measurement, von Helmholtz, 292. — Ether Calorimeter, Neesen: Elec- 

 trolysis of Water, von Helmholtz, 293. 



Geology and Natural History. — Explosive volcanic eruption in Japan, J. S. Mans- 

 field, 293. — American Geological Society: Cambrian Trilobites from Sardinia, 

 G-. Meneghini, 294. — Bibliography of the Foraminifera, Recent and Fossil, 

 C. D. Shkrbfrn: Decomposition of Native Iron Sulphides, A. A. Julien: 

 Rock-Forming Minerals, F. Rutley: Uraninite, W. F. Hillebrand: Heather 

 in Townsend, Mass., Ball, 295. — Insect Life, 296. — Fauna of British India, 

 W. T. Blanford: Entomology for Beginners, A. S. Packard, 291. 



Miscellaneous Scientific Intelligence. — American Association for the Advancement 

 of Science, 297. — India in 1887, as seen by Robert Wallace, 302. — Eclectic 

 Physical Geography, R. Hinman, 303. 



Obituary. — Silas Stearns, 303. — R. Clausius: Richard A. Proctor: Philip 

 Henry Gosse: M. Henri Debray, 304. 



