L2 



K. MITSÜKCRI. 



er side. The same stimulus, however, caused some others to go further 

 upward toward the dark. 



Another case : — 



Experiment 12 (Aug. 30) : — The same arrangement as before. Water 

 sprayed on for 30 minutes on a number of individuals. After 10 minutes 

 for another 3 minutes. After 40 minutes the reaction nearly ceased. 

 Then water sprayed another 3 minutes. 



During that time, 2 individuals were observed to go upwards. 



Several individuals were seen moving down. 



One of these down-moving ones was picked up and as quickly as 

 possible placed in the center of the flat dish described in Experiment 5. 

 It crawled toward light, i. e. was iwsitively phototaxic. The dish was 

 turned around 180 degrees. The individual turned around also and 

 resumed its positive course. It made no difference whether the light side 

 of the flat dish was lifted and made higher than the darker side. 



A second individual which was also moving down the incline was 

 quickly put in the center of the same dish. This became negatively 

 lihotota.ric. The process of moving this one had probably disturbed the 

 condition, whatever that may be, under which it was moving down the 

 incline in its positive course. The first individual and this one were 

 moving in two opposite directions on the same dish, at the. same time. 



A third individual also moving down was similarly transferred to 

 the flat dish. It became negatively phototaxic. On being placed back on 

 the incline it marched upward. 



A fourth also going down was similarly transferred. This was 

 2)Onitively phototaxic. Put back on the incline it went down. 



A fifth individual, going down, removed on the flat dish was posi- 



Uve. 



A sixth (L. sitcliana var breviculct), going down, removed on the 

 flat dish, negative. 



A seventh, going down, removed on the flat dish, positive. 



