This is Volume XXXIV of thirty-eight in the General Psychology series. Originally published in 1924, the present book is an attempt to supplement the slight sketch of the Anxiety Hypothesis put forward in ‘The Psychology of Self-Consciousness’. The former book aimed at explaining the difference between the difference between the perceptual and conceptual aspects of life, and at showing, by reference to general literature, the anxiety elements in human thought. In this book in Part I anxiety is described as arising through the reciprocal actions of introjection and projection to supply the warp and woof not only of individual character, but of an unseen spiritual self; in Part II is traced out the sinuous course of the dream life conceived as a dramatic cycle.