Issued January 15, 1913. 



.U. S,. DEPARTMENT OF AGRICULTURE, 

 BDREAD OP ENTOMOLOGY— CIRCULAR No. 169. 



L. O. HOWARD, EntomolocUt and Chief of Bureau. 



SAC BROOD, 



T DISEASE OF BEESv 



»x ,, , 



G. F. [WHITE;' M. D., Ph. D., 



Expert in Bacteriology. 



71442" — 13 ' wAeHiNOTON : qovernment printing OFncE : 1011 



