Let us, for the present, give up the idea of finding the meaning of the dream and try instead to clear a path to a better understanding of the dream by means of the elements common to all dreams. From the relation of dreams to the sleeping condition, we concluded that the dream is the reaction to a sleep-disturbing stimulus. As we have heard, this is the only point upon which exact experimental psychology can come to our assistance; it gives us the information that stimuli applied during sleep appear in the dream. There have been many such investigations carried out, including that of the above mentioned Mourly Vold. Indeed, each of us must at some time have been in a position to confirm this conclusion by means of occasional personal observations. I shall choose certain older experiments for presentation. Maury had such experiments made on his own person. He was allowed to smell cologne while dreaming. He dreamed that he was in Cairo in the shop of Johann Marina Farina, and therewith were linked further extravagant adventures. Or, he was slightly pinched in the nape of the neck; he dreamed of having a mustard plaster applied, and of a doctor who had treated him in childhood. Or, a drop of water was poured on his forehead. He was then in Italy, perspired profusely, and drank the white wine of Orvieto. What strikes us about these experimentally induced dreams we may perhaps be able to comprehend still more clearly in another series of stimulated dreams. Three dreams have been recounted by a witty observer, Hildebrand, all of them reactions to the sound of the alarm clock: "I go walking one spring morning and saunter through the green fields to a neighboring village. There I see the inhabitants in gala attire, their hymn books under their arms, going church-ward in great numbers. To be sure, this is Sunday, and the early morning service will soon begin. I decide to attend, but since I am somewhat overheated, decide to cool off in the cemetery surrounding the church. While I am there reading several inscriptions, I hear the bell ringer ascend the tower, and now see the little village church bell which is to give the signal for the beginning of the service. The bell hangs a good bit longer, then it begins to swing, and suddenly its strokes sound clear and penetrating, so clear and penetrating that they make an end of--my sleep. The bell-strokes, however, come from my alarm clock.