1917.] NATURAL SCIENCES OF PHILADELPHIA. 343 



William Morris Davis, the recipient of the last Hayden Medal, 

 was elected a correspondent and fimile Henri Sauvage and William 

 Bullock Clark, correspondents, died. 



No international scientific congresses were held and no invitations 

 whatever to participate in important scientific activities were re- 

 ceived by the Corresponding Secretary. 



Thanks were received from the University of Pennsylvania Chapter 

 of the Society of the Sigma Xi and the American Society of Ichthyol- 

 ogists and Herpetologists for courtesies received in connection with 

 their meetings held in the Academy's building. 



Considerable scientific information was furnished to inquiring 

 correspondents. 



Statistics of the correspondence follow: 



Communications received: 



Acknowledging the reeeipt of the Academy's pubUcations 149 



Transmitting pubhcations to the Academy... 24 



Requesting exchanges or the supply of deficiencies 2 



Invitations to learned gatherings, celebrations, etc 



Notices of deaths of scientific men •_• 1 



Circulars concerning' the administration of scientific and educational 



institutions, etc 1'^ 



Photographs and biographies of correspondents 4 



Letters from correspondents , ^6 



Miscellaneous letters ^^ 



Total received 257 



Communications forwarded : 



AcknowledgiuT: gifts to the library 1069 



Requesting the suppty of deficiencies ...• 147 



Acknowledging gifts to the museum 123 



Acknowledging photographs and biographies 2 



Letters of sympathy or congi-atulation, addresses, etc 1 



Diplomas and notices of election of correspondents and delegates' creden- 

 tials 1 



Miscellaneous letters 10 '^ 



Annual reports and circulars sent to correspondents 180 



Total forwarded 1,630 



Respectfully submitted, 



J. Percy Moore, Corresponding Secretary. 



REPORT OF THE LIBRARIAN. 



The Librarian has stated in the report of the Recording Secretaiy 

 that he has been compelled by a disabling affection since last Sep- 

 tember to depend on the Assistant Librarian, William J. Fox, for 

 the performance of the duties of both offices, a service which he has 



