THE SWEETHEART OF A KING. The scene was not exactly new to me. Moved by the spirit of adventure, or by an access of ennui which overtakes me at times, I had several times visited the gaudy establishment of Mercer, on the fashionable side of Fifth Avenue in the Fifties. In either case I had found disappointment; where the stake is a matter of indifference there can be no excitement; and besides, I had been always in luck. But on this occasion I had a real purpose before me, though not an important one, and I surrendered my hat and coat to the servant at the door with a feeling of satisfaction. At the entrance to the main