They worked in buildings apart or in secluded rooms; and the constitution of M⸫ lodges, so far as the officers, their titles and duties, and the symbols are concerned, is so similar to theirs that one might be inclined to believe that the early Masons imitated the Roman collegia. This theory is not without semblance of plausibility. Rome, during several centuries, held sway over Gaul and Britain. Roman colonists settled in various parts of those countries. With their language and customs they imported many of their institutions and associations. That of the builders or collegia, as is manifest from the remains still existing of the magnificent roads and edifices of various kinds constructed by them. The Collegæ held their lodges wherever they established themselves; no doubt initiated new members. In the course of time, when those countries freed themselves from the yoke of Rome, these societies of builders became the associations of the itinerant operative masons which inherited the symbols, tokens and pass words of the Collegæ. These, in all probability, had received them, either from the Chaldean magicians, who flocked to Rome at the beginning of the Christian era, when the progress of philosophical incredulity had shaken the confidence in legal divination; or from some of the priests of inferior order, all initiated to part of the lesser mysteries, that, when the sacerdotal class having lost in majesty, power and wealth, in order to preserve whole its numerous hierarchy, repaired to the Capital of the world to escape misery by levying contributions on the credulity and superstition of the people. The Christian Church, on the one hand, the Roman emperors on the other, fearing the influence of those magicians and priests, persecuted them even to death. These learned and wise men formed secret societies to preserve and transmit their knowledge. These societies lasted during the Middle Ages—the Rosicrucians, the Theurgists, among them. Leibnitz, one of the greatest men of science that ever lived, who died in Hanover, in 1716, at the age of seventy years, became a member of one of these societies; and there received an instruction he had vainly sought elsewhere. Were their mysterious meetings remnants of the ancient learned initiations? Everything tends to make us suspect it. The trials and examinations to which those who applied for initiation were obliged to submit; the nature of the secrets they possessed; the manner in which they were preserved. In these again may be found an explanation of why so many of the Pythagorean doctrines made their way into Masonry.