ADDITIONAL COPIES 



OF THIS PUBLICATION" MAY BE PROCOEED FROM 



THE SUPERINTENDENT OF DOCUMENTS 



GOVERNMENT PRINTING OFHCE 



WASHINGTON, D. C. 



AT 



10 CENTS PER COPY 



PURCHASER AGREES NOT TO EESEIX OB DISTRIBUTE THIS 

 COPY FOE PROFIT.— PUB. EES. 57, APPROVED MAY 11, 1922 



II 



