CONTENTS. 



JSTum~ber 201. 



Aet. XIX. — Notes on the Geology of Florida; by William 



H. Dall 161 



XX. — Notes on the Deposition of Scorodite from Arsenical 

 Waters in the Yellowstone National Park ; by Arnold 

 Hague 171 



XXI. — The Effect of Magnetization on the Viscosity and 



Rigidity of Iron and of Steel; by C. Baeus 175 



XXII. — Fauna of the " Upper Taconic" of Emmons, in 

 Washington, County, N.Y. With Plate I. By Charles 

 D. Walcott i 187 



XXIII. — On the amount of Moisture remaining in a Gas 

 after drying by Phosphorus Pentoxide ; by Edwaed 

 W. Moeley , 199 



XXIV. — Is there a Huronian Group ? by R. D. Irving 204 



XXV. — Ovibos Cavifrons from the Loess of Iowa; by 



W. J. McGee . 217 



XXVI. — On the Chemical Composition of Howlite, with a 

 note on the Gooch method for the determination of 

 boracic acid ; by 8. L. Penfielp and E. S. Sperry... 220 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — On a Vapor-Calorimeter, Bunsen: On the density of 

 liquid Methane, Oxygen and Nitrogen, Olszewsky: On the experimental dem- 

 onstration of Avogadro's Hypothesis, Schall, 224. — On the Evolution of Sul- 

 phurous oxide and of Oxygen in Kipp's Apparatus, Neumann : On the Vapor- 

 density of Tellurium tetrachloride and on the Valence of Tellurium, Michaelis, 

 225. — On Diamide (Hydrazine), Curtius, 226. — Method of observing the ac- 

 tion of Magnets on Liquids, S. T. Morehead: Comparison of the radiations 

 from melting platinum and silver, J. Voille : Solidification of liquids by 

 pressure, E. H. Amagat, 227. — The Conductibility for heat of Bismuth in 

 the magnetic field, A. Righi: Size of the Silver Molecule, 0. Wiener: Changes 

 in the Ohm, Himstedt: The Chemistry of the Sun, J. Norman Lockyer, 228. 

 — Joint Scientific Papers of James Prescott Joule, 229. 



Geology and Mineralogy. — Note on the Characters and Mode of Formation of the 

 Coral Reefs of the Solomon Islands, being the results of Observations made in 

 l§82-84, H. B. Guppy, 229.— Explorations in Florida, Angelo Heilprin, 230. 

 — The summit-plates in Blastoids, Crinoids and Cystids and their Morpholog- 

 ical relations, Charles Wachsmuth and Frank Springer: Cliftonite, a cubic 

 form of graphitic carbon, Fletcher, 232. 



Miscellaneous Scientific Intelligence. — The Height of Summer Clouds, Ekholh and 

 Hagstrom, 233. — American Association for the Advancement of Science, 234, 



Obituary. — Spencer F. Baird, 240. 



