About three years ago my attention was first drawn to the fact, that the Stones both inside and outside numerous ancient buildings in England bore in many cases a peculiar mark or symbol, which was evidently the work of the original builders. It immediately occurred to me, that these Marks, if extensively examined and compared, might serve to aid in connecting, and perhaps discriminating, the various bands of operatives, who, under the protection of the Church, mystically united, spread themselves over Europe during the middle ages, and are known as the Free Masons.