Note 2 — THE STRUCTURE OF SIMPLE RHYTHM FORMS.

Professor Binet's doubt (L'Année Psychologique 1895, p. 204) that the propulsion of air from the elastic chamber and the rebound of the pen might interfere with the significance of the graphic record is more serious in connection with the application of this method to piano playing than here; since its imperfection, as that writer says, was due to the force and extreme rapidity of the reactions in the former case. The present series involved only light tapping and was carried on at a much slower average rate.