Book excerpt: This is Volume IX of thirty-two on a series on Developmental Psychology. First published in 1935, this study looks at the development of imagination in children. Which uses a method in which observation of the free behaviour of children plays the principal role, but in which experimental technique is represented by a somewhat rigorous control of conditions, by a discreet use of question and answer, and by an emphasis on the necessity for accurate and full report, while psychoanalysis, at the same time, contributes a depth of insight, a realization of the importance of affective factors, and an alertness for the significance of detail.