244 



a false impression of recovery from the disease is con- 

 veyed. During this period crawling may be virtually 

 absent, and even when it commences again, the pro- 

 portion may be a low one, because owing to the previous 

 loss of infested bees, the opportunities meantime for 

 infestation have been more limited. But all the time 

 there may be a rising proportion of infested bees. 



These facts explain those cases where a stock which 

 has been reduced by crawling losses when strengthened 

 by fresh bees, makes a good, though in most cases only 

 temporary, recovery. But such a recovery may be 

 effected at a critical time by fostering breeding by the 

 queen and providing foraging bees whilst the nectar flow 

 is at its height. 



