372 PROCEEDINGS OP THE AMERICAN ACADEMY 



Seven hundred and twenty-fifth Meeting. 



November 12, 1879. — Monthly Meeting. 



The President in the chair. 



The following papers were presented : — 



" On the Relative Replaceability of the Bromine in the 

 Three Brombenzylbromides." By C. Loring Jackson. 



" On a New Form of Astronomical Level." By William 

 A. Rogers. 



"On Orthobrombenzyl Compounds." By C. Loring 

 Jackson. 



" Measurements of the Satellites of Mars." By Edward 

 C. Pickering. 



" On the Destruction of Insect Pests by Means of Diluted 

 Yeast." By Hermann A. Hagen. 



The following paper was presented by title : — 



" Motion and the Calculus." By John Trowbridge. 



Seven hundred and twenty-sixth Meeting. 



December 10, 1879. — Monthly Meeting. 



The President in the chair. 



The President read a notice of the late Erastus B. Bigelow. 



On the motion of Professor Cooke, it was 



Voted, That Mr. Edward Atkinson be appointed to fill 

 the vacancy in the Centennial Committee occasioned by the 

 death of Mr. Bigelow. 



Professor Cooke read a letter from Professor G. Curtius, 

 acknowledging his election as Foreign Honorary Member. 



Professor Pickering spoke upon the desirability of the pos- 

 session by the Rumford Committee of a standard measure of 

 length and a standard kilogramme ; an unusual opportunity 

 for obtaining such a standard of length being now offered by 

 M. Tresca, of the French Commission which has had in charge 

 the determination of measures of length. Professor Pickering 



