1904.] 
NATURAL SCIENCES OF PHILADELPHIA. 
841 
REPORT OF THE CORRESPONDING SECRETARY. 
During the past year, as usual, the bulk of the correspondence with 
scientific societies and institutions was concerned with the exchange 
of periodical publications, the number of which acknowledged shows 
a material increase. Several proposals to exchange publications were 
referred to the Publication Committee, and requests for the loan of 
collections or offers of specimens to the Curators. 
The year has been noteworthy for the number of deaths of prominent 
scientific men and for the importance of its international congresses of 
learning. Formal notices of no fewer than eight deaths of Presidents 
of societies and Directors of museums were received and duly acknowl- 
edged in letters of condolence. 
Invitations to the Academy to participate were received from the 
Organizing Committees of four international congresses, but in each 
case, beyond an expression of interest, no formal action was taken by 
the Academy and no delegates were appointed. 
The deaths of four distinguished correspondents — Karl A. Zittel, 
Henry M. Stanley, R. A. Phillippi and Eduard von Martens — occurred 
during the year and were announced from the Chair. In the election 
of Profs. A. A. W. Hubrecht, of Utrecht, and Frantisek Vejdovsky, of 
Prag, the high standard of scientific attainment now required by the 
Academy as a condition of corresponding membership is maintained. 
Fourteen correspondents have contributed their photographs, accom- 
panied in most cases by biographical sketches. 
Following are the statistics of the year’s correspondence: 
Communications Received. 
Acknowledging the Academy’s publications, 197 
Transmitting publications, 71 
Requesting exchanges and the supply of deficiencies, 7 
Invitations and notices, 6 
Announcements of deaths of scientific men, 8 
Circulars concerning the administration of scientific institutions, etc., . . 11 
Photographs and biographies of Correspondents, 14 
Letters from Correspondents, 13 
Miscellaneous letters, 35 
Total received, 362 
Communications Forwarded. 
877 
77 
Acknowledging gifts to the Library, . 
Acknowledging gifts to the Museum, 
