PHOTIC REACTIONS OF HONEY-BEE 



351 



The cylindrical chamber, which measured approximately 84 

 cm. in height by 87 cm. in diameter, was constructed on a light 

 wooden framework covered on the exterior with heavy, corru- 

 gated cardboard. On the interior it was lined with a thickness 



Fig. 1 Plan of directive light area, showing two trails of a normal bee. Note 

 the deflection of the courses in the non-directive region near the lamp and directly 

 beneath it. 



of dead white, cotton cloth, backed by a layer of heavy white 

 paper. Oii one side of the cylinder, and extending from its bot- 

 tom edge, a rectangular opening 58 cm. high by 32 cm. wide was 

 cut through the cardboard and paper layers. The white cloth 

 lining only closed this opening, and it was here slit from top to 

 bottom, the bottom edges being left free. The two flaps thus 



