Reactions of Isopods to Light 



259 



being in Section 6. This shows that the non-directive thigmotac- 

 tic, or other, influences due to the transference of the animals to 

 new quarters, and the photokinetic influences were still eff^ective. 

 However, after about an hour from the beginning of the experi- 

 ment the collecting toward the negative end and the avoiding of 

 the positive end became quite marked, and little tendency to 

 move toward the positive end manifested itself. The animals 



TABLE II 



AsELLUs COMMUNIS (zi individuals) 

 November 24, 1906 

 Previous exposure: disuse daylight 



Illumination: horizontal^ ~^55 C.M.; lamp at Section-6 end 

 In tank 10 minutes 



THE JOURNAL OF EXPERIMENTAL ZOOLOGT, VOL. 8, NO. 3 



