“ ‘L�� me give you a piece of advice,’ said Miakus, ‘for you need it. First, never intrust any secret to a friend, which, if revealed, would bring trouble or disgrace. Never interfere in a brawl or quarrel, no matter who is right or who wrong; but always let the world do its own fighting, while you stand by to avail yourself of any advantage that chance may disclose; and lastly, keep what you know until there shall be a market for it. Now we will test our magic glass,’ and forthwith we went into the rear office, which by that time had been refitted, so far as glass and carpet were concerned. “In his hands he bore the rose-wood box, which he laid upon the table, while, by the aid of four gimlets, he fixed a silken screen, or curtain, entirely across the room, having previously closed the shutters to exclude every ray of daylight from the apartment. “ ‘That,’ said he ‘is a magic screen. You have seen a magic-lantern exhibition. Well, this is to be a similar one, without the lantern. I now open this box, as you see, and take from it this mirror, which is, as you observe, merely two plates of