Fig. 1.— Normal healthy brood, showing the plump, bulging surface of sealed 

 brood, and the unsealed larvae of the unsealed cells. 



Fig. 2.— A comb affected with American foul brood, showing the flat and con- 

 cave surface of the sealed cells, the broken cappings and the discolored comb 

 in comparison with Fig. 1. This comb had a very offensive odor, although 

 the dead larvae had dried down to a scale. 



