Observation shows that the experiences of _trance states_ and allied conditions are similarly conserved. Fanny S., as the result of an emotional shock, due to a distressing piece of news, goes into a trance-like state of which she has no memory afterwards. Later, a recollection of this supposedly unconscious state, including the content of her trance thoughts and the sayings and doings of those about her, is recovered by a special device. B. C. A. likewise fell into a trance of which there was no recollection. The whole incident was equally fully recovered in a crystal vision, and also conscious memory of it brought back to personal consciousness by a special technic. In the vision she saw herself apparently unconscious, the various people about her each performing his part in the episode; the doctor administering a hypodermic dose of medicine, etc. In hypnosis she remembered in addition the thoughts of the trance consciousness and the various remarks made by different people in attendance. Even _delirious states_ for which there is complete amnesia may be conserved. I have observed numerous instances of this in the case of Miss B. For instance, the delirious acts occurring in the course of pneumonia were reproduced in a crystal vision by Miss B. and the delirious thoughts as well were remembered by the secondary personality, Sally.[42] I have records of several examples of conservation of delirium in this case. Quite interesting was the repetition of the same delirium due to ether narcosis in succeeding states of narcosis as frequently happened. A very curious phenomenon of the same order was the following: After the subject had been etherized a number of times I adopted the ruse of pretending to etherize one of the secondary personalities, using the customary inhaler but without ether. The efficient factor was, of course, suggestion. The subject would, at least apparently, become unconscious, passing into a state which had all the superficial appearances of deep etherization. At the end of the procedure she would slowly return to consciousness, repeat the same stereotyped expletives and other expressions which she regularly made use of when ether was actually used, and make the same grimaces and signs of discomfort, etc. This behavior would seem to indicate that the mental and physical experiences originally induced by a physical agent were conserved and later reproduced under imaginary conditions.