CONTENTS. 



Number 255. 



Page 



Art. XX. — Mt. St. Elias and its Glaciers ; by I. C. Russell. 



With a map, Plate IV 169 



XXL— Hudson River "Fiord"; by A. M. Edwards 182 



XXII. — Contributions to Mineralogy, No. 52 ; by F. A. 

 Genth. With Crystallographic Notes; by S. L. Pen- 

 field 184 



XXIII. — Tschermak's Theory of the Chlorite Group and its 



Alternative ; by F. W. Clarke 190 



XXIV. — Recent Fossils near Boston ; by W. Upham 201 



XXV. — The Highest Old Shore Line on Mackinac Island; 



by F. B. Taylor '____■_ 210 



XXVI. — Nature of Colloid Solutions; by C. E. Linebarger 218 



XXVII. — Observations upon the Structural Relations of the 

 Upper Huronian, Lower Huronian and Basement Com- 

 plex on the North Shore of Lake Huron; by R. Ptjm- 

 pellt and C. R. Van Hise 224 



XXVIII. — A Phasemeter ; by J. Trowbridge 292 



XXIX. — Preliminary Report of Observations at the Deep 



Well, Wheeling, West Virginia; by W. Hallock 234 



XXX.— Mount Bob, Mount Ida, or Snake Hill; by T. W. 



Harris 236 



Appendix. — XXXI. — Discovery of Cretaceous Mammalia, 



Part III ; by O. C. Marsh. With Plates V-XI 249 



SCIENTIFIC INTELLIGENCE. 



Physics and Astronomy — Variation in the Density of Water with the Tempera- 

 ture, D. Mendeleeff: New Method of obtaining a Constant Temperature, H. 

 Clew : Velocity of Sound in membranous bodies, L. Melde : A Surface Bo- 

 lometer, Dr. Kurlbaum: Orthochromatic Photography, MM. Fabre and 

 Andoyer, 239. — Prize for Researches in Physics: Astronomical Expeditions 

 to Peru, 240. — Causes of the Phenomena of Terrestrial Magnetism, H. Wilde, 

 241. — Astronomical Handbook for the year 1892, 242. 



Geology and Mineralogy — Honor to the United States Geological Survey from the 

 French Academy of Sciences, 242. — Geology of. the Tonga or Friendly Islands, 

 J. J. Lister. 243. — Notes on the Palaeozoic Species mentioned in Lindley and 

 Hutton's "Fossil Flora," R. Kidstox: Correlation Papers, Cambrian, C. D. 

 Wjlcott: Index to the known Fossil Insects of the World, including Myria- 

 pods and Arachnids, S. H. Scudder, 244. — Removal of gold from suspension 

 and solution by Fungoid growths, A. Ltversidge: Les Methodes de Synthese 

 en Mineralogie, S. Meunier, 245. — Brief notices of some recent^ described 

 minerals, 246. 



Obituary — Thomas Sterry Hunt, 246. — Sir George Biddell Airy: John 

 Couch Adams, 248, 



