ADVERTISEMENT. 



The object of the General Appendix to the Annual Eeport of the 

 Smithsonian Institution is to fnrnish 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 pur- 

 pose, or selected from foreign journals and proceedings ; 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 correspond- 

 ents of the Institution. 



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