Freud compared the study of occultism to biting into a sour apple, a metaphor that becomes more profound the more one savors it. Marie Nelson refers to the refusal of psychoanalytic training institutes to bite into the sour apple and their rejection of any colleague who is interested in the occult, in contrast to the very active interest that Freud showed in the subject. Before commenting on the articles that follow, she makes some observations about the phenomena that are concurrent with the irruption (bursting in) of Psi. She herself had a vivid olfactory experience that accompanied her anticipation of the future.