I wish to acknowledge important aid at various points in this study. All the high school subjects were secured through the courtesy of Mr. John Schwatka, Principal of School 70. The college students in experiment IV were tested by Mr.
The series of which this study l is the third part, has taken on two aspects, in a sense different, and yet capable of being confused. It has seemed wise to differentiate between these aspects at some length before proceeding to the discussion of the third study. It has been most convenient to do this in the way of a very brief summary of the series. The summary includes some of the major results of the series-even anticipating those of the study about to be reported.
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