512 PROCEEDINGS OP THE AMERICAN ACADEMY. 



Force and Internal Resistance of Batteries. By William L. 

 Hooper. 



Contributions from the Physical Laboratory of Harvard 

 University : I. Observations on Atmospheric Electricity. 

 By A. L. McRue, A. McAdie, and John Trowbridge. 

 II. Effect of Temperature on Magnetism. By John Trow- 

 bridge and A. L. McRae. III. Standard of Light. By John 

 Trowbridge. 



My. William II. Pickering exhibited some instantaneous 

 photographs. 



The following papers were presented by title : — 



Telescopic Search for the Trans-Neptunian Planet. By 

 David P. Todd. 



A Comparison of the Observations made between 1860 

 and 1883 of Stars situated between +70° and +89° Decli- 

 nation, with the Positions of the Harvard College Observa- 

 tory Catalogue of 1213 Stars. By Anna Winlock. 



On the Decomposition of Cinchonine. By Arthur jNIichael. 



Action of Chromic Superfluoride on Benzoic Acid. By 

 C. Loring Jackson and George T, Hartshorn. 



A Method of testing colored Media for the Dark Room. 

 By William H. Pickering. 



Absolute Sensitiveness of Photographic Dry Plates (con- 

 tinued). By William H. Pickering. 



On the Viscosity of Gases. By Silas W. Holman. 



