D 



JOHN S. NEWBERRY. 



Pagel 



Geological Facts recently observed in Montana, Idaho, Utah and 



Colorado, (Oct. 17, i8Si) 4 



Hypothetical High Tides, as Agents of Geological Change (Jan. 



9,1882) 80 



The Origin and Relations of the Carbon Minerals, (Feb. 6, 1882) 109 



The Ancient Civilizations of America, (Lecture, Feb. 20, 1882). . 120 



JOHN K. REES. 



The International Time-System, (Jan. 16, 1882) 86 



Some Results of Photography as Applied to Astronomy, (Lecture, 



March 20, 1882) 143 



ISRAEL C. RUSSELL. 



Sulphur Deposits in Utah and Nevada, (May 22, 1882) 168 



JAMES H. STEBBINS, JR. 



On some New Salts of Thymole Sulpho-Acid, and some New 



Facts concerning the same, (Oct. 3, 1881) 3 



W. LE CONTE STEVENS. 



Wheatstone and Brewster's Theory of Binocular Perspective (Oct. 



24, 1 881), with three woodcuts 8 



The Mammoth Cave of Kentucky, (Dec. 12, 1881), with one 



figure 58 



A New Reversible Stereoscope, (Feb. 13, 1882) 118 



JOHN J. STEVENSON. 



The Mineral Resources of Southwest Virginia, (April 24, 1882). 159 



ROBERT H. THURSTON. 



On the Behavior of Steam in the Steam Engine Cylinder, and on 



Curves of Efficiency, (Feb. 13,1882) ii! 



WILLIAM p. TROWBRIDGE. 



On the Deternnnaiion of the Heating Surface Requiied in Steam 

 Pipes employed to produce any Required Discharge of Air 

 through Ventilating Chimneys, (Dc-c. 19, 1881) 67 



F. G. WEICHMANN. 

 Fusion-Structures in Meteorites. (April 10, 1882) i 53 



