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284 observes the wonderful co-ordinating numbers of that triangle." A noted Chicago writer said: "Laying aside all mysteries, all assumption and all ordinary magic manifestations connected with that well known combination called 'playing cards,' the co-ordinations found in Prof. Richmond's demonstration of the 'Mystic Triangle,' alone is

THE MYSTIC TRIANGLE.

sufficient to convince any intelligent person of the magic—and one might almost say divine—qualities of the emblems therein." In setting forth the work, I left one very important co-ordination for my readers to discover for themselves. Some ten or twelve of them did make the discovery, and wrote and spoke to me of the same.