Bui. 671 , U S. Def>t. of Agriculture. 



ME II. 



FiQ. 1.— Comb Containing Brood Dead of Sacbrood. 

 Natural size. (White.) 







Fig. 2.— Stained Smear Preparation Showing Spores of Nosema apis. 



Highly magnifled. (Original.) 

 SACBROOD AND NOSEMA SPORES. 



