The House of Life after nightfall is very dark; the windows are high, for the most part narrow, and, though there are a great many of them, most are painted, so that even on a clear and bright day there is not more light than enough to carry on experiments, and, if I had my way, I would clear out all the painted glass. It is, of course, provided with the electric light; but this is seldom used except in the short and dark days of winter, when work is carried on after nightfall. In the evening the place is absolutely empty. John Lax, the Porter, occupies the South Porch and keeps the keys. But there is another and smaller door in the north transept. It leads to a Court of Cloisters, the ancient use of which has long been forgotten, the key of which is kept by the Arch Physician himself. It was with this key--at this entrance--that he came into the House. He opened the door and closed it behind him. His footstep was not the only one; a lighter step was heard on the stones as well. In the silence of the place and time the closing of the door rumbled in the roof overhead like distant thunder, and the falling of the footsteps echoed along the walls of the great building. The two companions did not speak. A great many years ago, in the old times, there was a Murder done here--a foul murder by a band of soldiers, who fell upon a Bishop or Saint or Angel--I know not whom. The memory of the Murder has survived the name of the victim and the very religion which he professed--it was, perhaps, that which was still maintained among the aristocracy when I was a boy. Not only is the memory of the murder preserved, but John Lax--who, soon after the Great Discovery, when we took over the building from the priests of the old religion, was appointed its Porter and heard the old stories--would tell all those who chose to listen how the Murderers came in at that small door and how the murder was committed on such a spot, the stones of which are to this day red with the blood of the murdered man. On the spot, however, stands now a great electrical battery. The Arch Physician, now about to betray his trust, led his companion, the woman Mildred Carera, by the hand past this place to the steps which lead to the Inner House. They ascended those steps. Standing there, still outside the Inner House, Dr. Linister bade the woman turn round and look upon the Great House of Life. The clouds had dispersed, and the moonlight was now shining through the windows of the South, lighting up the colored glass, painting bright pictures and patterns upon the floor, and pouring white light through those windows, which are not painted, upon the clustered pillars and old monuments of the place. Those who were now gathered in the Inner House listened, holding their breath in silence.