ADVERTISEMENT. 



The object of the General Appendix is to furnish summaries of 

 scientific discovery in particular directions ; occasional reports of the 

 investigations made by collaborators of the Institution ; memoirs of a 

 general character or on special topics, whether original and prepared 

 expressly for the purpose, or selected from foreign journals and pro- 

 ceedings; and briefly to present (as fully as space will permit) such 

 papers not published in the "Smithsonian Contributions" or in the 

 "Miscellaneous Collections" as may be supposed to be of interest or 

 value to the numerous correspondents of the Institution. 

 340 



