OF ARTS AND SCIENCES. 331 



of tlic " Life and Works of Count Rumford" at the same rate 

 as the Resident Fellows. 



The committee appointed to consider the memorial of the 

 Boston Society of Civil Engineers, regarding the introduc- 

 tion of the metric system, reported, recommending that the 

 President be authorized to sign this memorial. After con- 

 siderable discussion, it was 



Vvtcd^ To indelinitely postpone this subject. 



The following papers were presented : — 



" On George B. Grant's Calculating Machine." By 

 William A. Rogers. 



" On the Methods and Precision of Meridian Observa- 

 tions." By Truman H. Safford. 



" On a New Form of Induction Apparatus." By Henry P. 

 Bowditch. 



" On the Binary System of Arithmetic." By Benjamin 

 Peirce. 



Six hundred and ninety-first Meeting. 



May 10, 1870. — Monthly Meeting. 



The President in the chair. 



The Corresponding Secretary read a letter from Mr. J. L. 

 Sibley, acknowledging his election into the Academy. 



The Corresponding Secretary presented the Annual Report 

 of the Council, which was accepted, and is hereto appended. 



The following papers were presented : — 



" Some Formulae relating to the Motions of Planets and 

 Comets." By T. H. Safford. 



" On the Three Brombenzylbromides." By C. L. Jackson. 



" On Telegraphing Musical Sounds." By A. G. Bell. 



''' On the Perturbations of Uranus by Neptune." By 

 Benjamin Peirce. 



Professor Pickering presented the following papers : — 



" On the Intensity of Sound." By W. W. Jacques. 



" On the Diffraction of Sound." By W. W. Jacques. 



