These theses, while they have no direct bearing on the psychoanalytic field, are well presented from the standpoint of experimental psychology. They emphasize that the problem of learning with its various components should occupy the focus of attention in present day psychology. In the first paper the theory of “trial and error” in learning has been made the basis of experimentation and discussion. The rat has been used as the experimental animal.

The second paper mentioned represents an attempt to work out a standard method for determining the child's “learning span” by means of special arrangements of groups of digits, and by presenting them to the subject in a variety of ways.

The third paper deals with the application of several performance tests to groups of school girls in the 9th grade in order to study certain sets of norms. Several partial conclusions, which suggest additional problems, were made.

Lewis