The Academy of Natcral Sciences of Philadelphia, 



March 13, 1920. 



I hereby certify that printed copies of the Proceedings for 1919 were 

 mailed as follows: 



Pages 1-16 May 20, 1919. 



17-120 June 13, 1919. 



121-152 September 11, 1919. 



153-168 ; ; October 15, 1919. 



169-206 '. December 3, 1919. 



207-318 March 13. 1920. 



P]DWARD J. NOLAN, Recording Secretary, 



Per WILLIAM J. FOX, Ading Editor. 



PUBLICATION committee: 



Henry Skinner, M.D., ScD., Witmer Stone, A.M., Sc. D. 



Henry A. Pilsbry, Sc.D., William J. Fox, 



Edward J. Nolan, Sc.D. 



The President, John Cadwalader, A.M., LL.D., ex-officio. 

 EDITOR: Edward J. Nolan, M.D., Sc.D. 



