430 PROCEEDINGS OF THE AMERICAN ACADEMY 



" On the Prediction of Neptune." By Professor Benjamin 

 Peirce. 



" On the Theor}^ of Absorption Bands, and its Bearing on 

 Photography and Chemistry." By Doctor Robert Amory. 



" On the Use of a Lens of Long Focus as a Collimator." 

 By Doctor Robert Amory. 



Professor Cooke presented, by title, the following paper : — 



" On the Copper-bearing Rocks of Lake Superior." By 

 Professor Raphael Pumpelly. 



Professor Peirce presented the following papers by title : — 



" On Surfaces of the Second Order as treated by Quater- 

 nions." By Abbott Lawrence Lowell. 



" Spherical Conies." By Gerritt Smith Sykes. 



" Livestigations in Quaternions." By Washington Irving 

 Stringham. 



Professor J. B. Thayer presented to the Academy a vol- 

 ume of letters and remembrances of the late Chauncey 

 Wright. 



The following gentlemen were elected members of the 

 Academy : — 



George Clark, of Cambridge, to be a Resident Fellow in 

 Class I., Section 2. 



Thomas P. James, of Cambridge, to be a Resident Fellow 

 in Class IL, Section 2. 



John Fiske, of Cambridge, to be a Resident Fellow in 

 Class IIL, Section 1. 



Charles Greely Loring, of Boston, to be a Resident Fellow 

 in Class IIL, Section 4. 



Ezekiel B. Elliott, of Washington, to be an Associate 

 Fellow in Class L, Section 1. 



Raphael Pumpelly, of Owego, to be an Associate Fellow 

 in Class II., Section 1. 



Charles Sanders Peirce, of New York, to be an Associate 

 Fellow in Class IIL, Section 1. 



Carl Nageli, of Munich, to be a Foreign Honorary Member 

 in Class IL, Section 2, in place of the late Alexander Braun. 



