PHILOSOPHICAL SOCIETY OF WASHINGTON. 



F. M. Endlich. 



On some interesting Oases of Metamorphism . , 



E. Pbisby. 



Remarks on the Total Solar Eclipse of January 11th, 1880 



On Magic Squares 



G. K. Gilbert. 



On the Kanab Base-line and a new method of Base-measure 



ment 



On Air-currents on Mountain Slopes .... 

 Eemarks on the Relations of Permian to other Strata . 

 On the Oscillations of Lake Bonneville 

 On the Drainage System of the Black Hills of Dakota 



T. N. Gill. 



On some Remarkable Instances of Ingestion among Fishes . 



F. M. GUNNELL. 



On the Disinfection of Ships from Yellow Fever 



A. Hall. 



On the Supposed Discovery of a Trans-Neptunian Planet in 



1850 



On the Satellites of Saturn ....... 



Notes on the Orbits of Titan and Hyperion . . . . 



W. Hakkness. 



On the Color Corrections of Achromatic Objectives 



On the number of Lenses required in an Achromatic Objec- 



tive . 

 On the Solar Corona 



J. E. HiLGARD. 



On JablokofF's Electric Candle .... 

 Exhibition of two Phosphorescent-dial Clocks 

 Remarks commemorative of J. H. Lane 



E. S. HOLDEN. 



On the Brightness of the Third Saturnian Satellite 

 On Gould's TJranometria Argentina 



Dr. J. R. M. Irby, (of Baltimore, Md.) 



Some Observations on the crystalline State of Matter 



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