Different sized envelopes are used, three in all. Three spectators are asked to step forward for a simple test of matter through matter. Each is given an envelope to examine. This being done, one man seals the smallest envelope and marks his initials across the pasted flap. He himself puts it into the next larger size envelope. The holder of that one seals and initials in the same manner as the first. This set of two he places in the largest envelope and the third person seals and initials, the nest of three sealed and marked envelopes being then placed…