The experiences that I have thus far cited in evidence of the principle of the conservation of dormant experiences that cannot be voluntarily recalled have been drawn almost entirely from normal everyday life. We now come to a series of facts which are very important in that they show that what is true of the experiences of everyday life is also true of those of _artificial_ and _pathological_ states of which the normal personal consciousness has no cognizance. These facts are also vital for the comprehension of post-hypnotic phenomena, of amnesia, multiple personality, and allied dissociated states. Let us consider some of the states from the point of view of conservation. =Artificial states.=—After a person passes from one _dissociated state_ to another, or from a dissociated state to the full waking state, it is commonly found that there is amnesia for the previous state. This is a general principle. The forgetting of dreams is an example from normal life. For the psychological state of sleep in which dreams occur is one of normal dissociation of consciousness by which the perception of the environment, and the great mass of life’s experiences, can no longer be brought within the content of the dream consciousness. Hence there is a general tendency to the development of amnesia for dreams after waking when the normal synthesis of the personality has been established. Yet, as we have seen, forgotten dreams can generally be recalled in hypnosis or by some other technical method (e. g., crystal visions and abstraction). Now _hypnosis_ is an artificially dissociated state. After passing from one hypnotic state to another,[33] or after waking, it is very common to find complete amnesia for the whole of the experience belonging to the previous hypnotic state. By no effort whatsoever can it be recalled and this inability persists during the remainder of the life of the subject. And yet those hypnotic experiences may have been very extensive, particularly if the subject has been hypnotized a great many times. Nevertheless, it is easy to demonstrate that they are conserved and therefore, like all conserved experiences, potentially still existing, subject to recall under favoring conditions; for, as is well known, if the subject be rehypnotized they are recalled as normal memories. With the restitution of the hypnotic state the memories which were dormant become synthesized with the hypnotic personality and conscious.