Maury whose book, "Sleep and Dreams," published in 1865, was probably the first serious attempt at deciphering the enigma of dream thoughts, had various experiments performed on himself to determine what dreams would be brought forth by physical stimuli. He was tickled with a feather on the lips and nostrils. He dreamt that a mask of pitch was applied to his face and then pulled off, tearing the skin. A pair of tweezers was held close to his ear and struck with a metallic object. He heard the tolling of bells and thought of the revolutionary days of 1848. A bottle of perfume was held to his nose. He dreamt of the East and of a trip to Egypt. A lighted match was held close to his nostrils. He dreamt that he was on a ship whose magazine had exploded. A pinch on the back of the neck suggested the application of a blister and evoked the memory of a family physician. A sensation of heat made him dream that robbers had entered the house and were compelling the inmates to reveal where their money was hidden by scorching the soles of their feet. Words were pronounced aloud. He attributed them to some people with whom he had been talking in his dreams. A drop of water was allowed to fall on his forehead. He dreamt that he was in Italy, feeling very hot and drinking wine. A red light suggested to him a storm at sea. Struck on the neck, he dreamt that he was a revolutionist, arrested, tried, sentenced to death and guillotined. I have had some of Maury's experiments repeated on myself and the connection between the physical stimulus and the content of the dream leaves no doubt as to the direct relation between the two. On the other hand, the reader will notice that the same stimuli applied to Maury and to me produced absolutely different results. Compare my first and second experiments with his first and third. 1. I was tickled on the nose with a feather. I dreamt that I was entering a forest and that branches and leaves were brushing against my face. I made an effort to push them away with my hand. (I had taken a ride through Central Park that very day). 2. A bottle of perfume was held open under my nose. I dreamt of a landscape with thick clouds and mist to the left. Two dark figures carrying grips were hurrying toward the right where there seemed to be open fields, flowers, and sunlight. (The day preceding the dream had been cloudy.) 3. My nose was stroked with a piece of paper. I dreamt I met a certain writer who asked me whether another writer had seen a certain lady and her daughter. I answered rather indifferently and went on my way. Then I saw either the other writer or myself seated before a window and showing a tall gaunt woman and another indistinct figure, either Japanese prints or some manuscript, and I woke up. (The day preceding the dream I had revised a manuscript for a woman and also spoken of one of the two writers.) 4. Cold steel was applied to my throat.