CONTEXTS. 



« 



Page. 

 Art. X. — Isothermals, Isopiestics and Isometrics relative to 



Viscosity ; by C. Barus 87 



XL— " Potential " a Bernoullian Term; by G. F. Becker.. 97 

 XII. — Datolite from Loughboro, Ontario; by L. V. Pirsson 100 

 XIII. — Xew Machine for Cutting and Grinding thin sections 



of Rocks and Minerals; by G. H. Williams 102 



XIV. — Stannite and some of the Alteration Products from 



the Black Hills, S. D.; by W. P. Headden 105 



XV. — Occurrence of Hematite and Martite Iron Ores in 



Mexico; by R. T. Hill; with notes on the associated 



Igneous Rocks; by W. Cross 111 



XVI. — Caesium-Lead and Potassium-Lead Halides ; by H. L. 



Wells .... 121 



XVII. — Ceratops Beds of Converse County, Wyoming ; b}^ 



J. B. Hatcher . „ . 135 



XVIII. — LTse of Planes and Knife-edges in Pendulums for 



Gravity Measurements; by T. C. MENDEisrHALL 144 



XIX. — Preliminary note on the colors of cloudy condensa- 

 tion ; by C. Barus 150 



XX. — Lines of structure in the Winnebago Co. Meteorites 



and in other Meteorites; by H. A. Newton 152 



XXL — Preliminary Note of a new Meteorite from Japan ; 



by H. A. Ward 153 



Appendix. — XXII. — Restoration of Anchisaurus ; by O. C. 



Marsh. (With Plate VI) ._ 169 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — He-conversion of Heat into Chemical Energy in the 

 production of Gas, Naumann, 155. — Temperature of Ignition of Electrolytic 

 Gas, Freyer and V. Meter : Electromotive Activity of the Ions, Nernst and 

 Pauli, 156. — Separation of Precipitates at the Surface bounding Electrolytes, 

 Kummell: Chemical Phenomena at low Temperatures, Pictet, 157. — New 

 Telephotographic lens, T. R. Dallmeter: Oxygen for lime light, T. C. Hep- 

 worth, 158. — Interference of Electric "Waves : Explanation of Ball's phenom- 

 enon, E. Lohmel : Mercury Voltaic arc, H. Avon, 159. 



Geology and Natural History — North American Fossil Mammals, 159. — Geology 

 of the Eureka District, A. Hague, 161. — Geological Survey of Alabama, E. A. 

 Smith: Geological Atlas of the United States. Chattanooga sheet, Tennessee: 

 North American Continent during Cambrian Time, C. D. Walcott: Lafayette 

 Formation,. W. J. McGee: Origin and Nature of Soils, N. S. Shaler, 163. — 

 Cambrian Fossils of New Brunswick, G. F. Matthew : Experiments in Physical 

 I Geology, E. Reter: Brief notices of some recently described minerals, 164. — 

 Large Variations in the Metamorphosis of the same species, "W. K. Brooks and 

 F. H. Herrick, 166. — Morphologische Studien, K. Schumann, 167. 



Miscellaneous Scientific Intelligence — Bulletin from the Laboratories of the State 

 University of Iowa: Astronomical Journal Prizes: Ostwald's Klassiker der 

 Exakten "Wissenschaften. 168. 



