.1 



ADVERTISEMENT. 



The object of fbe General Appendix is to furuish 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 proceed- 

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

 not published in the " Smithsonian Contributions" or in the "Miscella- 

 neous Collections" as may be supposed to be of interest or value to the 

 numerous correspondents of the Institution. 

 156 



