During the nine years 1 since the latest review of psychophysical measurement methods by Rich (120), the growth of interest in this field has suffered no relapse. New methods, refinements and generalizations of old ones, and applications of psychophysical principles to an ever widening range of problems, both theoretical and practical, have marked the period. We shall take up in order the following topics: The Comparison of Psychophysical Methods, The Method of Single Stimuli, Categories of Judgment, Special Influences upon the Judgment, Statistical Considerations, General and Theoretical Considerations, and New Applications.Comparison of Psychophysical Methods.Among the major papers on the comparison of psychophysical methods was that of Kellogg (83) in which an effort was made to determine the relationship between the methods of average error and constant stimuli. Kellogg wished to set up equations whereby the values obtained by one method could be related to those of the other, and to determine which method was the ' better ' by the criteria of reliability, accuracy, magnitude of sensitivity values yielded, and applicability to the study of Weber's law. Assuming that the method of average error gave no limen, Kellogg treated his results in terms of the variable error (VE) and constant error (CE) provided by each method, the intermediate category of judgment having been excluded from the method of constant stimuli. In general the VE's and CE's of constant stimuli were larger than those of average error, the differences