as of writing was heard. What actually happened, in accordance with the methods revealed by Dr. Hodgson, was somewhat as follows: Mr. Davey possessed two precisely similar locked slates, with common keys. Davey was out of the room whilst the sitter was writing his question in slate A. On his return he diverted the sitter's attention—probably by asking him to examine the under side of the table—and took advantage of the opportunity to substitute the locked slate B for A. He then gave the sitter some ordinary slates to clean and examine, and whilst he was thus occupied, Davey left the room with A, opened it, and wrote the answer to the question. On his return he found some other method of diverting the sitter's attention, and resubstituted A for B. The sound of writing was produced by Davey's finger-nail scratching the under surface of the slate, or by some similar device; and the miracle was accomplished.
It may seem incredible that Davey, who performed this particular trick at practically every séance, and sometimes, as in the present case, twice at the same sitting, should never have incurred detection, or even suspicion, in the double process of substitution described. But in the first place, he made a practice of carrying on the second experiment (b) whilst (a) was still in progress, so that the sitter had two slates instead of one to watch; and, further, he had several devices for distracting the sitter's attention, of which not the least effective was his conjurer's patter. Davey allowed me to be present at one of
