XIV DATES OP PUBLICATION. 



Vol. XXI (1869), No. 1 (pages 1-80). Presented to Academy meeting, July 



20, 1869. 



2 (pages 81-168, Biol. Sect. 1-8). Receipt acknowledged 



by the Smithsonian Institution, July 30, 1869. 



3 (pages 169-190, Biol. Sect. 9-18). Presented to Aca- 



demy meeting, February 8, 1870. 



4 (pages 191 et seq.). Ditto, April 12, 1870. 



Vol.XXII(1870),No.l (pages 1-64). Receipt acknowledged by the Smith- 

 sonian Institution, July 8, 1870. 



2 (pages 65-92, Biol. Sect. 1-4). Presented to Academy 



meeting, October 4, 1870. 



3 (pages 93 et seq.). Ditto, March 14, 1871. 



The dates of printing of the signatures of the subsequent volumes will be 

 found on the reverse of the title pages. 



