symptoms. On awaking she had forgotten the words for and the knowledge of the simplest things. She had again to learn to read, write, and count; her progress was rapid in this re-learning. After a second attack she again woke in her normal state, but without recollection of the period when she had forgotten things. These states alternated for more than four years, during which consciousness showed continuity within the two states, but was separated by an amnesia from the consciousness of the normal state.
These selected cases of various forms of changes of consciousness all throw a certain light upon our case. Naef’s case presents two hysteriform eclipses of memory, one of which is marked by the appearance of delusions, and the other by its long duration, contraction of the field of consciousness, and desire to wander. The peculiar associated impulses are specially clear in the cases of Proust and Mesnet. In our case the impulsive tearing up of the flowers, the digging up of the graves, form a parallel. The continuity of consciousness which the patient presents in the individual attacks recalls the behaviour of the consciousness in MacNish’s case; hence our case may be regarded as a transient phenomenon of alternating consciousness. The dream-like hallucinatory content of the limited consciousness in our case does not, however, justify an unqualified assignment to this group of double consciousness. The hallucinations in the second state show a certain creativeness which seems to be conditioned by the auto-suggestibility of this state. In Mesnet’s case we noticed the appearance of hallucinatory processes from simple stimulation of taste. The patient’s subconsciousness employs simple perceptions for the automatic construction of complicated scenes which then take possession of the limited consciousness. A somewhat similar view must be taken about our patient’s hallucinations; at least the external conditions which gave rise to the appearance of the hallucinations seem to strengthen our supposition. The walk in the cemetery induced the vision of the skeletons; the meeting with the three boys arouses the hallucination of children buried alive whose voices the patient hears at night-time.
