PHOTIC REACTIONS OF HONEY-BEE 



357 



2i X 360° 



-^ = +5.017 cm. 



26.95 cm. X 6 



It is to be emphasized that the value + 5.01° /cm., does not sig- 

 nify that the animal turned only toward the functional eye. It 

 merely shows that the algebraic sum of all its deflections aver- 

 ages 5.01°/cm. toward the functional eye. 



Animal fir\uA rraUU^JiAxx, 

 Experiment No. 1 3 

 No. of Animal 5 

 Date l^io/f^ ^^''' 



TimeH 50 ATn.x^' 



Eye black L4*.^< 



Light 157 Tnrtc. "-^ 



No. dx. loops a^ b^ 

 No. sn. loops a^ b^ 

 Trail length, cm. a li. 



bi 



ii.is Vt ^.l ** 



Fig. 4 Two trails of bee no. 135 in non-directive light. 



A record is shown in figure 4 which represents two trials taken 

 in rapid succession. This was necessitated by the animal's en- 

 countering the side wall of the light chamber so quickly that the 

 first trial was shorter than usual. The deflections in these trails 

 are estimated as previously described. It will be noted, however, 

 that in the trail marked a, the angular deflection between m 

 and n does not amount to quite f of a sinistral loop, although it is 

 so counted. In such instances the angle was always estimated 



THE JOURNAL OF EXPERIMENTAL ZOOLOGY 



•OL. L'9, NO. 



