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 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. 

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