744 PROCEEDINGS OF THE AJIERICAN ACADEMY. 



The following papers were read by title : — 



" The Process of building up the Voltage and Current in a 

 Long Alternating-Current Circuit." By A. E. Kennelly. 



" High Electromotive Force with its Application to Spectrum 

 Analysis." By John Trowbridge. 



Nine htrndrecl and seventy-third Meeting. 



April 10, 1907. 



The President in the chair. 

 There were present sixteen Fellows. 



The Corresponding Secretary read the following letters : From 

 Edward H. Hall, William C. Lane, and William Z. Riple}', 

 acknowlecisfing election as Resident Fellows ; from Hermann 

 Diels, acknowledging election as Foreign Honorary Member ; 

 from Amos E. Dolbear and Henry G. Denny, thanking the 

 Academy for its invitation to attend the meetings and to use 

 the library ; from the Geological Society of London inviting the 

 Academy to appoint a delegate to attend its centennial cele- 

 bration, September 26, 27, and 28, 1907 ; from the Comite 

 Geologique de la Russie, announcing the death of M. Nicholas 

 Sokolow ; from Columbia University in the City of New York, 

 announcing the Loubat prizes to be awarded in 1908. 

 The Chair announced the following death : — 

 Marcellin Berthelot, Foreign Honorary Member in Class I, 

 Section 3. 



The following delegates were appointed by the chair : — 

 Professor Ephraim Emerton (Professor Angelo Celli of Rome, 

 alternate), to attend the celebration at Bologna of the three 

 hundredth anniversary of the death of Ulisse Aldrovandi, 

 June 12, 1907 ; President James Burrill Angell, to attend the 

 celebration at Lansing, Michigan, of the fiftieth anniversary of 

 the Michigan Agricultural College, May 28 to 31,1907; Pro- 

 fessor Edward Laurens Mark, to attend the Seventh Liter- 

 national Zoological Congress at Boston, August 19 to 23, 1907. 

 The following communications were given : — 

 " On the Physiological Basis of Illumination." By Dr. Louis 

 Bell. 



