The author is interested in determining in what direction the spread of our knowledge of psychology tends; what results seem desirable and probable in the struggle going on in the various fields of energy which are thrashing out its problems. For centuries introspection was practically the only means of study employed by philosophers; then came the experimental method. In this connection Toulouse emphasises the importance in our measurements of having physically and chemically defined standards. It is not only necessary to have a number to express our toil measurement, it must be a number determined by precise conditions. The difficulties under which various workers labour are pointed out, especially that of obtaining average subjects for experiments.
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