ADDITIONAL COPIES 



OF THIS PCBUCATION MAT BE PROCUKEE FROM 



THE eUPERINTEITOENT OF DOCUMENTS 



GOVERNMENT PRINTING OFFICE 



WASHrNOTON, D. C. 



AT 



25 CENTS PER COPY 

 . SimscRiPTioN Per Year, 12 Numbers, J2.60. 



