THE CAUSE OF EUROPEAN FOUL BROOD. 



ease by which its presence can be diagnosed while the larva; are still 

 alive. Some of these will now be considered. 



Fio. 1. — Larva sick of European foul 

 brood, partly removed by the bees. 

 (Original. I 



Fig. 2. — Healthy larva of the age repre- 

 sented in figure 4. (Original.) 



The length of time that a developing bee is sick of European foul 

 brood is variable. It can be stated in a general way that the three 



Fig. 3. — Sick larva of the age represented 

 in figures 2 and 4. (Original.) 



days just preceding the time when 

 a larva would ordinarily be capped 

 is the most favorable period for 

 making a diagnosis from the gross 

 examination alone. 



When healthy larvae of the age 

 rej^resented in figures 2, 3. 4, and 

 5 are slightly magnified a peristal- 



FiG. 4. 



-Sick larva with roof of cell 

 removed. (Original.) 



