OF ARTS AND SCIENCES. 509 



to be a Foreign Honorary Member in Class II., Section 2, 

 in place of the late Oswald Heer. 



Gaston Camille Charles Maspero, of Cairo, to be a Foreign 

 Honorary Member in Class III., Section 2, in place of the 

 late Karl Richard Lepsius. 



The following papers were presented : — 



Biographical Memoir of the late George Bentham. By Asa 

 Gray. 



(a.) Photographic Exposers or Drop Shutters. (6.) Meth- 

 ods of determining the Speed of Photographic Exposers. By 

 William H. Pickering. » 



The following paper was presented by title : — 



Contributions to American Botany : I. Revision of the 

 Roses of North America. II. Description of some new Spe- 

 cies of Plants, chiefly Western. By Sereno Watson. 



Seven hundred and seventy-ninth Meeting. 



February 11, 1885. — Monthly Meeting. 



A quorum was not present, and the Academy was not 

 called to order. 



Seven hundred and eightieth Meeting. 



March 11, 1885. — Stated Meeting. • 



The President in the chair. 



The Corresponding Secretary read the following letters : 

 from the Marquis de Saporta and August W. Eichler, ac- 

 knowledging their election as Foreign Honorary Members ; 

 from Denman W. Ross and Edward L. Mark, acknowledging 

 their election as Resident Fellows ; from the Royal Society 

 of Canada, inviting the Academy to send a delegate to be the 

 guest of the society during its annual meeting at Ottawa, 

 beginning on May 19th ; from a committee at Pisa, inviting 

 the Academy to be present at the presentation of a gold 

 medal to Professor Menghini; from the Royal Academy of 



