Not far from the enormous Baths which the Emperor Diocletian,--as if to atone for preferring to reside in Nicomedia or Salona rather than in Rome,--had had built on the northeastern slope of the Viminal as far as the spot where the height merges into the Quirinal, there stood near the Collina Gate a singular structure, almost recalling in the ponderous splendor of its brilliantly-painted façade the royal palaces of Assyria and Persia, yet as fresh and new as if it had just emerged from the hands of architect and workmen, an architectural embodiment of the taste of an age which had a fancy for cleverly imitating the style of by-gone times, not only in the weak creations of a degenerate literature, but in other departments of human activity. True, in this instance it had not been the architect’s whim or his employer’s taste, but a definite, practical purpose that had replaced the simple façade of the Roman dwelling by this fantastic luxury of the East. Behind the ponderous pillars adorned with heads of animals, Olbasanus, the Chaldean enchanter and conjuror of evil spirits, the declared favorite of the Roman ladies, practised his mysterious arts,--and thus the exterior of the spacious structure harmonized with the strange events that occurred within. The foreign aspect of the front might be regarded as a preparation for the chosen ones whom Olbasanus permitted to cross the threshold of his secret sanctuary. Lucius Rutilius and Caius Bononius reached the door at the very moment it was opened from within, allowing a tall, thin figure, wrapped in a thick paenula, to pass into the street. Spite of the mild weather, the stranger had drawn over his head the hood worn as a protection from the rain. Stepping a little aside, the two youths made room for the disguised figure. “I ought to know that gait and bearing,” said Lucius Rutilius, looking after the hurrying form; but he vainly strove to recollect. Meantime the porter had not closed the door, but holding a lantern of chased silver with panes of oiled papyrus, admitted the two visitors. Caius Bononius gave him a silver coin and asked if the Chaldean could be seen, according to his appointment.