1881.] NATURAL SCIENCES OF PHILADELPHIA. 481 



During the past year our membership has been increased by the 

 addition of six Correspondents, who have been promptly notified 

 of their election, and from nearly all of whom acceptances have 

 been received. 



To those who have favored the Academy with donations to the 

 Museum, prompt acknowledgments have been sent ; these, to the 

 number of one hundred and sixty-one, represent for the most part 

 not single specimens, but masses of valuable material, a record of 

 which will appear in the Curators' report. 



The letters received are in great part either notices of the 

 transmission of the publications of Corresponding Societies, or 

 acknowledgments of the reception of our own by them. 



The summary is as follows : 



Letters of transmission, 49 



Letters of acknowledgment, 58 



Responses from Correspondents, 6 



• Miscellaneous, 13 



representing eight}' Scientific Societies, Public Libraries, Insti- 

 tutions of original research, and other bodies organized for the 

 increase and diffusion of knowledge. The number of Corres- 

 ponding Societies shows an annual increase. 



During the year notices of the death of several Correspondents 

 have been received, and published in the current Proceedings. 

 Respectfullj' submitted. 



George H. Horn, M. D., 



Corresponding Secretary. 



REPORT OF THE LIBRARIAN. 



The Librarian respectfully reports that during the year ending 

 November 30, 1881, there have been 2119 additions made to the 

 library of the Academy. As heretofore, the greater part of these 

 have been the publications of scientific societies, received in ex- 

 change for those of the Academy. The increase has been composed 

 of 396 volumes, 2273 pamphlets and separate parts of periodicals 

 and 50 maps and plates. 



