As preliminary to the inquiry which is about to be instituted, it is necessary to distinguish the Stone of Foundation, both in its symbolism and in its legendary history, from other stones which play an important part in the masonic ritual, but which are entirely distinct from it. Such are the _corner-stone_, which was always placed in the north-east corner of the building about to be erected, and to which such a beautiful reference is made in the ceremonies of the first degree; or the _keystone_, which constitutes an interesting part of the Mark Master's degree; or, lastly, the _cape-stone_, upon which all the ritual of the Most Excellent Master's degree is founded. These are all, in their proper places, highly interesting and instructive symbols, but have no connection whatever with the Stone of Foundation or its symbolism. Nor, although the Stone of Foundation is said, for peculiar reasons, to have been of a cubical form, must it be confounded with that stone called by the continental Masons the _cubical stone_--the _pierre cubique_ of the French, and the _cubik stein_ of the German Masons, but which in the English system is known as the _perfect ashlar_. The Stone of Foundation has a legendary history and a symbolic signification which are peculiar to itself, and which differ from the history and meaning which belong to these other stones. Let us first define this masonic Stone of Foundation, then collate the legends which refer to it, and afterwards investigate its significance as a symbol. To the Mason who takes a pleasure in the study of the mysteries of his institution, the investigation cannot fail to be interesting, if it is conducted with any ability. But in the very beginning, as a necessary preliminary to any investigation of this kind, it must be distinctly understood that all that is said of this Stone of Foundation in Masonry is to be strictly taken in a mythical or allegorical sense. Dr. Oliver, the most learned of our masonic writers, while undoubtedly himself knowing that it was simply a symbol, has written loosely of it, as though it were a substantial reality; and hence, if the passages in his "Historical Landmarks," and in his other works which refer to this celebrated stone are accepted by his readers in a literal sense, they will present absurdities and puerilities which would not occur if the Stone of Foundation was received, as it really is, as a philosophical myth, conveying a most profound and beautiful symbolism. Read in this spirit, as all the legends of Masonry should be read, the mythical story of the Stone of Foundation becomes one of the most important and interesting of all the masonic symbols.