The results of 5 experiences with the LSD 25 made with three patients are reported, pointing out especially the therapeutic properties of this drug as an aid in psychotherapy. Special consideration is given to the following properties: a) regressive action upon ego that facilitates the appearing of internal conflicts under a strong emotive charge in transfer; b) nonuniform action upon ego keeping out some parts that in this way not only assist but can also, during the experience, analyse the obtained material; c) keeping in the patient's memory of what he lived during the experience, allowing its analysis later on and out of lysergic action. In the author's opinion this method will have its full utility only when employed by a psychoanalyst who is able to work with material obtained from unconscious.
