OP ARTS AND SCIENCES. 485 



Seven hundred and seventy-second Meeting. 



May 14, 1884. — Monthly Meeting. 



The President in the chair. 



The Corresponding Secretary read letters announcing the 

 death of Francois Auguste Alexis Mignet, Foreign Honorary 

 Member ; also, an invitation to the twenty-fifth anniversary 

 of the Offenbacher Verein fiir Naturkunde. 



The Corresponding Secretary also announced that Volume 

 XIX. of the Proceedings would be ready for distribution at 

 the adjourned annual meeting, and that the twentieth volume 

 had been already begun. 



The President announced the death of Charles Adolphe 

 Wurtz, Foreign Honorary Member. 



The following papers were presented : — 



" Systematic Errors of Magnitudes in Star Catalogues." 

 By Edward C. Pickering. 



" Recent Photographic Investigations at the Massachusetts 

 Institute of Technology." By William H. Pickering. 



The following papers were presented by title : — 



" Transverse Magnetic Effects in Various Metals." By 

 Edwin H. Hall. 



" A Comparison of the Right Ascensions derived from 

 Harvard College Observations of Maskelyne Stars during the 

 years 1870-79 with the Fundamental Systems of Newcomb 

 and Auwers." By William A. Rogers. 



" Results of Recent Investigations conducted at the Physi- 

 cal Laboratory, Cambridge." By John Trowbridge. 



