learning and permanency of modifications wrought by training--Results of a
study of the efficiency of discrimination methods--Comparison by means of
indices of modifiability--Number of tests per series versus number of
series--Efficiency as measured by memory tests.


CHAPTER XVI

THE DURATION OF HABITS: MEMORY AND RE-LEARNING

Measures of the permanency of modifications in behavior--The duration of
brightness and color discrimination habits--The relation of learning to
re-learning--Can a habit which has been lost completely be re-acquired
with greater facility than it was originally acquired?--Relation of
special training to general efficiency--Does the training in one form of
labyrinth aid the dancer in acquiring other labyrinth habits?


CHAPTER XVII

INDIVIDUAL, AGE, AND SEX DIFFERENCES IN BEHAVIOR

Individual peculiarities in sensitiveness, docility, and initiative--The
relation of docility to age--The individual result and the average--How
averages conceal facts--Sex differences in docility and initiative--
Individual differences of motor capacity which seem to indicate
varieties--Is the dancer pathological?


CHAPTER XVIII