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 vibrate in an unaccountable manner in opposite directions over different metals. On consideration, I closed my eyes whilst the ring was oscillating over gold, and on opening them I found that it had become stationary. I got a friend to change the metals whilst I was blindfolded—the ring no longer vibrated. I was thus enabled to judge of the involuntary action of muscles, quite sufficient to have deceived an eminent medical man like Mr. Mayo, and to have perplexed me till I succeeded in solving the mystery.