EARLY WORK IN THE BEE-CITY 93 



keep up the gentle circulation which then is alone 

 needed. 



Sometimes, when the colony is unusually large, 

 the fanning-party will be divided into two detach- 

 ments, one at each side of the entrance, leaving 

 the centre for the inflow of air. In this case a 

 double-loop system of ventilation appears to be 

 formed. 



