330 PROCEEDINGS OF THE AMERICAN ACADEMY 



Substances raised to Incandescence." By W. W. Jacques, 

 of Johns Hopkins University, Baltimore. 



" On the Action of Bromine on Substituted Toluols." By- 

 Professor C. L. Jackson and Mr. A. W. Field. 



Seven hundred and twenty-first Meeting. 



May 14, 1879. — Monthly Meeting. 



The President in the chair. 



The Corresponding Secretary announced that he had re- 

 ceived letters from T. W. Draper, of Boston, R. H. Rich- 

 ards, of Boston, H. H. Richardson, of Brookline, Asaph 

 Hall, of Washington, T. C. Donders, of Utrecht, and F. de 

 Lesseps, of Paris, accepting membership in the Academy. 



Mr. R. C. Winthrop read the following report from the 

 committee appointed to consider the best manner of cele- 

 brating the centennial of the Academy : — 



" The committee appointed to report a plan for the com- 

 memoration of the Centennial Anniversary of the Academy 

 next spring, recommend that a meeting of the Academy be 

 arranged for some day in 1880, which shall be decided on as 

 most suitable, at which a commemorative address or addresses 

 shall be delivered by the President and any other members 

 who may be selected for the purpose, and that it be followed 

 by a social festival of such nature as shall hereafter be thought 

 best ; that in the mean time efforts be made to raise a centen- 

 nial fund for securing a hall for the Academy, or for such other 

 purposes as may be thought desirable ; that the Secretaries, 

 with such assistance as they may desire, prepare a history of the 

 foundation, rise, and progress of the Academy, to be printed 

 in connection with the account of the Centennial Celebra- 

 tion ; and that, for the purpose of carrying out this pro- 

 gramme, a committee of arrangements of members be ap- 

 pointed by the chair, with full powers." 



Dr. H. P. Bowditch described a new form of Plethysmo- 

 graph. 



