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168 at the time. If one is inaccurate, both may be. Further, if it is only by the accident of there being two accounts that this inaccuracy has become manifest, we are entitled to infer that there are probably other inaccuracies which happen not to have been manifested.

Another class of error is illustrated by Mr. Grottendieck's statement that he "saw quite distinctly that the stones came right through the kadjang." As Mr. E. T. Dixon has pointed out in his comments on the case, "no retinal image or succession of retinal images could have recorded the passage of stones through the kadjang; he can only have (unconsciously) inferred that the stones passed through from the fact that he was not aware of any retinal image representing them coming up to the ceiling from the boy's hand (or wherever they did come from)."

It is probable that the appearance of the stones falling slowly is also, as Mr. Grottendieck himself suggests, due to a sensory fallacy of another kind. This appearance is very commonly reported of the objects seen to move through the air in Poltergeist cases. Such an appearance would be caused by