424 PROCEEDINGS OF THE AMERICAN ACADEMY 



£ight hundred and nineteenth Meeting. 



February 13, 1889. — Adjourned Stated Meeting. 



The President in the chair. 



The President announced the death of John Call Dalton, 

 of New York, Associate Fellow. 



The Corresponding Secretary read letters from the New 

 York Academy of Sciences, requesting aid in erecting a 

 monument to Audubon ; from the United States Commis- 

 sioner to the Paris Exhibition, requesting information in 

 reference to the library of the Academy ; and from the Ro3'al 

 Academy of Sciences of Turin, announcing the conditions of 

 competition for the seventh Bressa Prize. 



The following papers were presented : — 



The Application of the Stroboscopic Method to the Study 

 of the Excursion of the Electrode of a Microphone Trans- 

 mitter. By Charles R. Cross. 



On the Rotation resulting from the Vibration of a Chladni 

 Plate. By Amos E. Dolbear. 



On Pentamidobenzol. By C. Loring Jackson and A. W. 

 Palmer. 



On Reversible Chemical Reactions. By P. C. Freer. 



£ight hundred and twentieth Meeting. 



March 13, 1889. — Stated Meeting. 



The President in the chair. 



The following gentlemen were elected members of the 

 Academy : — 



Cecil Hobart Peabody, of Boston, to be a Resident Fellow 

 in Class I., Section 4. 



Peter Schwamb, of Boston, to be a Resident Fellow in 

 Class I., Section 4. 



Henry Willey, of New Bedford, to be a Resident Fellow 

 in Class IL, Section 2. 



