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Rh any temporary aberration in the estimation of time; and we know that such erroneous estimates occur in delirium, and under the influence of haschish, and other drugs, and apparently in the partial dissociation of consciousness which accompanies many waking hallucinations.

It should be added that the hallucinations described by the child Lemonnier may perhaps have been genuine. The young persons round whom these disturbances occur frequently describe hallucinatory figures seen by them, and there is evidence, in many of the cases investigated by or reported to the Society, of hysteria or marked abnormality of one kind or another.

It is only by a fortunate accident that we are able, here and there, to analyse the evidence for the spontaneous phenomena of the Poltergeist, and demonstrate its untrustworthiness. But in the next chapter we shall see how little to be trusted are the statements of competent witnesses as to phenomena