normal state and in pathological states, are numerous and complex.

It has been the purpose of this study to establish as far as possible
strictly objective criteria for distinguishing normal from abnormal
associations, and for this reason we have made no attempt to determine
by means of introspection the causes of variations of reaction time.

It would seem that the importance and magnitude of the problem of
association time are such as to demand not merely a crude measurement
of the gross reaction time in a large number of cases, but rather a
special investigation by such exact methods as have been used by
Cattell [1] and others in the analysis of the complex reaction. It
would be impracticable for us to employ such methods in a study so
extensive as this.

[Footnote 1: Mind, Vol. XI, 1886.]

In view of these considerations we discontinued the recording of the
reaction time.

If the association test is to be useful in the study of pathological
conditions, it is of great importance to have a reliable measure of
the associational value of a pair of ideas. Many attempts have been
made to modify and amplify the classical grouping of associations
according to similarity, contrast, contiguity, and sequence, so as to
make it serviceable in differentiating between normal and abnormal
associations.

In this study we attempted to apply Aschaffenburg's [1] classification
of reactions, but without success. Our failure to utilize this system