A nearly exact formula for the dream has been contributed by Freud and Rank, “On the foundation and with the help of repressed infantile sexual material, the dream regularly represents as fulfilled actual wishes and usually also erotic wishes in disguised and symbolically veiled form.” (Jb.; ps. F., p. 519, and Trdtg., p. 117.) In this formula the wish fulfillment, following Freud’s view, is preponderant, yet it would appear to me that it is given too exclusive a rôle in the (chiefly affective) background of the dream. An important point is the infantile in the dream, in which connection we must mention the Regression. Regression is a kind of psychic retrogression that takes place in manifold ways in the dream (and related psychic events). The dream reaches back towards infantile memories and wishes. [Sometimes this is already recognizable in the manifest dream content. Usually, however, it is first disclosed by psychoanalysis. Strongly repressed, and therefore difficult of access, is this infantile sexual material. On the infantile forms of sexuality, see Freud, “Three Contributions to Sexual Theory.”] It reaches back also from the complicated and completed to a more primitive function, from abstract thought to perceptual images, from practical activity to hallucinatory wish fulfillment. [The latter with especial significance in the convenience dreams. We fall asleep, for instance, when thirsty, then instead of reaching for the glass of water, we dream of the drink.] The dreamer thus approaches his own childhood, as he does likewise the childhood of the human race, by reaching back for the more primitive perceptual mode of thought. [On the second kind of regression the Zurich psychiatrist, C. G. Jung, has made extraordinary interesting revelations. His writings will further occupy our attention later.] Nietzsche writes (“Menschliches, Allzumenschliches”), “In sleep and in dreams we pass through the entire curriculum of primitive mankind.... I mean as even to-day we think in dreams, mankind thought in waking life through many thousand years; the first cause that struck his spirit in order to explain anything that needed explanation satisfied him and passed as truth. In dreams this piece of ancient humanity works on in us, for it is the germ from which the higher reason developed and in every man still develops. The dream takes us back into remote conditions of human culture and puts in our hand the means of understanding it better. The dream thought is now so easy because, during the enormous duration of the evolution of mankind we have been so well trained in just this form of cheap, phantastic explanation by the first agreeable fancy. In that respect the dream is a means of recovery for the brain, which by day has to satisfy the strenuous demands of thought required by the higher culture.” (Works, Vol. II, pp. 27 ff.)