BEES IN COLONIES AFFECTED BY EUROPEAN FOULBEOOD 



9 



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 



M M M M § M M M ^ ^ 



c^iwdis'ss'o ^t^d't// ya ly-^ffA^^^ 



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 become evident that the colony was being overrun by: 

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

 134440°— Bull. 804—20 i 



