286 PKOCEEDINGS OF THE AMERICAN ACADEMY 



Six liwnclred and ninety-ninth Meeting. 



March 14, 1877. — Stated Meeting. 



The President m the chair. 



The President announced the death of Alexander Braun, 

 Wilhehn Hofraeister, J. C. Poggendorff, and Karl Ernst Von 

 Baer, Foreign Honorary Members; and of C. H. Davis, 

 Charles Wilkes, and F. B. Meek, Associate Fellows. 



The following gentlemen were elected members of the 

 Academy : — 



Alexander Graham Bell, of Salem, to be a Resident Fel- 

 low in Class I., Section 3. 



Jeremiah Lewis Diman, of Providence, to be an Associate 

 Fellow in Class III., Section 3. 



William Ferrel, of Washington, to be an Associate Fellow 

 in Class I., Section 1. 



The Treasurer read a letter from the Hon. E. B. Wash- 

 burne, giving an account of the repairs which he had caused 

 to be made at the expense of the Academy of the monument 

 of Count Rumford at Paris. 



The following papers were presented : — 



A mathematical discussion of vortex rings in liquids, by 

 Professor John Trowbridge. 



Upon an application of Lane's law of the accumulation of 

 solar heat, by Professor Benjamin Peirce. 



On systematic errors in star declinations, by Professor 

 E. C. Pickering. 



Antigeny ; or, sexual dimorphism in butterflies, by Mr. S. H. 

 Scudder. 



On a new form of clock escapement, by Professor C. A. 

 Young. 



The following papers were presented by title : — 



Theory of the horizontal photoheliograph, including its 

 application to the determination of the solar parallax by means 

 of transits of Venus, by Professor William Harkness. 



On a base from the residues of aniline, by Professor C. L. 

 Jackson. 



