C. H. TURNER. 



degree of permanency of the newly acquired habit and the 

 number of shocks necessary to establish it." With this state- 

 ment my experiments are in accord. 



The results of training persist for a long time. Unequivocal 

 evidence of the persistence of the results of training were observed 

 after the following intervals; one day or less (all of the tables), 



a/ 



/O If 



S.f 30 



B 



r /o ty 10 ztr 30 3*~ to 



4T0 



60 



r 10 



3.0 



30 



D 



to 



FIG. 6. Reaction curves of three adult females from which the antennae have 

 been amputated; a represents refusals to enter the dark chamber, b represents 

 entrances into the dark chamber. 



two days (Table II 1 ., 156", i8B, igB, 2oB; Table III., 2G, 2M, 

 3/, 3M), three days (Table III., 36, 2K, 4^), four days (Table 

 III., 2), five days (Table I., iK), six days (Table II., i8, 

 i<)D; Table III., 3^, 3<9), ten days (Table III., i,D), sixteen 

 days (Table III., 2F), twenty-one days (Table I., iG). Moult- 



1 Throughout this section, the arabic numerals are the numbers of the roaches 

 and the capital letters represent the series of experiments. 



