326 



PROCEEDINGS OF THE AMERICAN ACADEMY 



Mr. N. D. C. Hodges, by invitation, described his new in- 

 strument for determining magnetic dip. 



Professor Peirce discussed the results of Professor Mitch- 

 ell's paper. 



Seven hundred and sixteenth Meeting. 



December 11, 1878. — Monthly Meeting. 



The President in the chair. 



The following papers were presented : — 



" On the Determination of Equipotential Curves and Sur- 

 faces b} r the Telephone." By A. Graham Bell. 



"On the Heat produced by the Magnetization and De- 

 magnetization of Iron, Nickel, and Cobalt." By John Trow- 

 bridge. 



Professor Bell gave a description of various ingenious ap- 

 pliances of M. Trouve, of Paris. Remarks on this subject 

 were made by Doctors Putnam and Williams. 



Mr. Scndder called attention to a catalogue of the serial 

 publications which are taken at the chief libraries in Boston 

 and Cambridge. 



Seven hundred and seventeenth Meeting. 



January 8, 1879. — Stated Meeting. 



The President in the chair. 



The Corresponding Secretary read letters from Messrs. 

 Ruskin, Carlyle, and Munro, accepting membership in the 

 Academy. 



On the motion of Mr. Winthrop, it was 



Voted, That the chair nominate six members of the Acad- 

 emy who, together with himself, will constitute a committee 

 of seven to consider the best manner of celebrating the one 

 hundredth anniversary of the foundation of the American 

 Academy of Arts and Sciences. 





