THE mysteries of the ancients, and the associations in which their doctrines were taught, have hardly been considered in modern times, but with a view to decry and ridicule them. The systems of ancient mythology have been treated as monstrous absurdities, debasing the human reason, conducting to idolatry, and favouring depravity of manners. However, they deserve attention, if the motives of their inventors, rather than the profligacy and ignorance of their corruptors be contemplated. When men were deprived of the light of revelation, those who formed systems of morality to guide their fellow creatures, according to the dictates of improved reason, deserved the thanks of mankind, however deficient those systems might be, or time may have altered them; respect, not derision, ought to attend the efforts of those good men; though their labours might have proved unavailing. In this point of view must be considered an association, traced to the most remote antiquity, and preserved through numberless viscissitudes, yet retaining the original marks of its foundation, scope, and tenets. It appears, that, at a very early period, some contemplative men were desirous of deducting from the observation of nature, moral rules for the conduct of mankind. Astronomy was the science selected for this purpose; architecture was afterwards called in aid of this system; and its followers formed a society or sect, which will be the object of this enquiry.