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" which may be supposed to be of interest or value to 

 the numerous corresi^oudents of the Institution. 



180 



