In two very interesting cases of these hallucinations, which have come under my notice, they were brought about by any cause which increased the quantity of blood in the brain, or retarded the flow of blood from this organ. Thus, a glass of champagne, or a few drops of laudanum, would induce them, as also would the recumbent posture, with the head rather low. As showing how readily dreams can be excited by impressions made upon the senses, M. Maury caused a series of experiments to be performed upon himself when asleep, which afforded very satisfactory results, and which are interesting in connection with the points already discussed in the present chapter. 1st Experiment. He caused himself to be tickled with a feather on the lips and inside of the nostrils. He dreamed that he was subjected to a horrible punishment. A mask of pitch was applied to his face, and then torn roughly off, taking with it the skin of his lips, nose, and face. 2d Experiment. A pair of tweezers was held at a little distance from his ear, and struck with a pair of scissors. He dreamed that he heard the ringing of bells; this was soon converted into the tocsin, and this suggested the days of June, 1848. 3d Experiment. A bottle of eau de Cologne was held to his nose. He dreamed that he was in a perfumer’s shop. This excited visions of the East, and he dreamed that he was in Cairo in the shop of Jean Marie Farina. Many surprising adventures occurred to him there, the details of which were forgotten. 4th Experiment. A burning lucifer match was held close to his nostrils. He dreamed that he was at sea (the wind was blowing in through the windows), and that the magazine of the vessel blew up. 5th Experiment. He was slightly pinched on the nape of the neck. He dreamed that a blister was applied, and this recalled the recollection of a physician who had treated him in his infancy. 6th Experiment. A piece of red-hot iron was held close enough to him to communicate a slight sensation of heat. He dreamed that robbers had got into the house, and were forcing the inmates, by putting their feet to the fire, to reveal where their money was. The idea of the robber suggested that of the Duchess d’Abrantes, who he supposed had taken him for her secretary, and in whose memoirs he had read some account of bandits. 7th Experiment. The word _parafagaramus_ was pronounced in his ear. He understood nothing, and awoke with the recollection of a very vague dream. The word _maman_ was next used many times. He dreamed of different subjects, but heard a sound like the humming of bees. Several days after, the experiment was repeated with the words _Azor_, _Castor_, _Léonore_. On awaking, he recollected that he had heard the last two words, and had attributed them to one of the persons who had conversed with him in his dream.