BEES IK COLONIES AFFECTED BY EUROPEAN FOULBROOD 



11 



Colony F (fig. 3), which was the next one to be infected, although 

 not as strong as colony G, was of Italian stock and did not show the 

 appearance of disease until one day later. On the fourth day one 

 cell appeared in each of two combs. It was not until the twenty- 



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fifth day that the disease had spread to seven combs, the total number 

 of diseased larvae being, as a whole, less than in the hybrid colony. 

 There was not brood in all seven combs at the time of infection, but 

 the brood increased faster than the disease spread. After the 

 twenty-fourth day a permanent improvement began to be manifest. 



