When the dreamer has acquired the technical skill which enables him, after a little concentration and meditation, to interpret his own sleep visions, he is no longer at the mercy of the annoyance called nightmare. When he can see at a glance where the repression seems unbearable, he may devise ways and means to satisfy his cravings more completely if they are justifiable and lawful; if they are unjustifiable or socially taboo, he may seek substitutes for them and, especially as I have explained in another book, free them from the parasitic cravings which make them unduly obsessive. He who can read the indications of his own dreams, has at his disposal an instrument of great precision which indicates to him the slightest fluctuations of his personality and, besides, points out various solutions for the problems of adaptation which the normal, progressive human being must solve every day of his life. Oneiromancy is the algebra which enables us to perform rapidly complicated calculations in the mathematics of psychology. BIBLIOGRAPHY ABRAHAMSON, I.--Mental disturbances in lethargic encephalitis. _Journal of Nervous and Mental Disease._ September 1920. A study of the sleeping sickness based mainly upon cases observed at Mt. Sinai Hospital. ABRAHAM, K.--Dreams and Myths. _Nervous and Mental Disease Monograph Series._ No. 28. A monograph proving that legends and myths are in reality the day dreams of the human race. ADLER, A.--Traum and Traumdeutung. _Zentralblatt f. Ps. A. III_, p. 574. A short essay on dream interpretation from the point of view of the ego urge. ASCHAFFENBURG, G.--Der Schlaf in Kindesalter und seine Störungen. Bergmann, Wiesbaden. Observations on the disturbances of the sleep of children. BRUCE, H. A.--Sleep and Sleeplessness. Little Brown. A popular exposé of the problem of sleeplessness from a modern point of view. CORIAT, I.--The Meaning of Dreams. Little Brown. A small book containing the analyses of many dreams according to the Freudian technique. CORIAT, I.--The Nature of Sleep. _Journal of Abnormal Psycho._ VI. No. 5. CORIAT, I.--The Evolution of Sleep and Hypnosis. Ibidem, VII. No. 2. DELAGE, Y.--La nature des images hypnagogiques. _Bulletin de l' Inst. Gen. Psycho._ 1903, p. 235. DU PREL, CARL.--Künstliche Träume. _Sphinx_, July 1889. A study of artificial dreams. FREUD, S.--The Interpretation of Dreams. Macmillan. FREUD, S.--Dream Psychology, with an introduction by André Tridon. McCann. The most important books on Dream Interpretation. FRÖMNER, E.--Das Problem des Schlafs. Bergmann, Wiesbaden. HENNING, H.--Der Traum ein assoziativer Kurzschluss. Bergmann, Wiesbaden. MAURY, A.--Le Sommeil et les Rêves. Paris 1878. The first attempt at a methodical study of dreams and at correlating them to physical stimuli. MAEDER, A. E.--The Dream Problem. _Nervous and Mental Disease monograph series._ No. 22.