IV CONTENTS. 



Number 32. 



Page 



Art. X. — Jurassic Formation on the Atlantic Coast. — Sup- 

 plement; by O. C. Marsh 105 



XI. — Mineralogical Notes; by C. N. Warren 110 



XII. — Origin and Significance of Spines : A Study in Evolu- 

 tion ; by C. E. Bekciier 125 



XIII. — Prehistoric Fauna of Block Island, as indicated by its 

 Ancient Shell-heaps; by G. F. Eaton. (With Plates 

 II and III.) 137 



XIV. — Registering Solar Radiometer and Sunshine Re- 

 corder ; by G. S. Isham _ _ 160 



XV. — Tertiary elevated Limestone Reefs of Fiji ; by A. 



Agassiz _ 165 



XVI. — Iodometric Determination of Molybdenum ; by F. A. 



Gooch and J. T. Norton, Jr 168 



XVII. — Solvsbergite and Tinguaite from Essex County, 



Mass.; by IT. S. Washington 176 



XVIII. — Occurrence of Native Lead with Roeblingite, 

 Native Copper, and other minerals at Franklin Furnace, 

 N. J.; by W. M. Foote 187 



XIX. — Position of Helium, Argon and Krypton in the 



Scheme of Elements ; by W. Crookes 189 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — New Constituent of Atmospheric Air, Ramsay and 

 Trayers, 192. — Direct Elimination of Carbon Monoxide and its Reaction with 

 Water, Engler and Grimm, 193. — Osmotic Pressure and Electrolytic Dissoci- 

 ation, Traube: Fusion in the Electric Furnace, Oddo, 194. — Ammonium Per- 

 oxide, Melikoff and Pissarjewski : Molecular Masses of Inorganic Salts, 

 Werner, 195.— Sodium Carbide, Matignon, 196. 



Geology and Mineralogy — Cycad Horizons in the Rocky Mountain Region, 0. 

 C. Marsh, 197.— Calamaria of the Dresden Museum, H. B. Geixitz: Fossil 

 Cephalopoda of the British Museum, G. C. Crick : Two new fossils from Canada, 

 J. F. Whiteayes: Brief notices of some recently described minerals, 198. 



Miscellaneous Scientific Intelligence — American Association for the Advancement 

 of Science: Harper's Scientific Memoir, 199. — Electro-Mechanical Series; In- 

 dustrial Electricity : Catalogue of Earthquakes on the Pacific Coast, 1769-1897 

 E. S. Holdex: Ostwald's Klassiker der Exacten Wisseuschaften, 200. 



