BEES IN COLONIES AFFECTED BY EUROPEAN FOULBROOD \) 



at the time of infection. The first high peak of the disease coming 

 on the nineteenth day was followed by a slight improvement, when 

 for a time the house cleaning exceeded the occurrence of fresh dis- 

 ease. This was probably due to the stimulus of the increasing honey 



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flow. But as soon as the next series of eggs hatched, the disease' 

 again gained the upper hand, reaching another higher peak on the 

 thirty-first day, at which time it was deemed necessary to start treat- ^ 

 ment. It had Ibecome evident that the colony was being overrun by 

 the disease. More and more dead larvae were being allowed to re-^ 



134440°— Bull. 804—20 2 



