RESPONSES TO LIGHT OF THE ROACH. 



383 



have acquired (Table III., number 3, Table IV., number 39) ; some 

 are slow to learn and not very retentive (Table I., number i, 

 Table II., numbers 18 and 19) ; some in learning display mediocre 

 ability but retain well what they have acquired (Table III., 



fl/ 



10 



li~ AQ if 30 3f IK) 



T 10 If .26 J.f 30 JT 



B 



to if *o or Jo 

 C 



r 10 if .20 

 D 



30 3*- 



FIG. 5. Reaction curves of five larval females one fourth of an inch long; 

 a represents refusals to enter the dark chamber, b represents entrances into the 

 dark chamber. 



number 4) ; yet others display mediocre ability to learn and are 

 not very retentive (Table IV., number 41). 



Szymanski states that "No relation is evident between the 



