1917.] 
NATURAL SCIENCES OF PHILADELPHIA. 
343 
William Morris Davis, the recipient of the last Hayden Medal, 
was elected a correspondent and Emile 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 receipt of the Academy’s publications. 149 
Transmitting publications to the Academy. 24 
Requesting exchanges or the supply of deficiencies. 2 
Invitations to learned gatherings, celebrations, etc. 0 
Notices of deaths of scientific men. 1 
Circulars concerning the administration of scientific and educa'ional 
institutions, etc. 13 
Photographs and biographies of correspondents. 4 
Letters from correspondents. 6 
Miscellaneous letters. 58 
Total received. 257 
Communications forwarded: 
Acknowledge x gifts to the library. 1069 
Requesting the supply of deficiencies. 147 
Acknowledging gifts to the museum. 123 
Acknowledging photographs and biographies. 2 
Letters of sympathy or congratulation, addresses, etc. 1 
Diplomas and notices of election of correspondents and delegates’ creden¬ 
tials. 1 
Miscellaneous letters . 107 
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 Secretary 
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 
