All three stand silent a moment. Then both gentlemen exclaim at once that they see. The queerness is clear enough to both. The footsteps on the snow all point away from the window, and a glance shows that there is no corresponding track of an approach to it.
None of the three seem to think the mystery soluble, for the moment, and mere speculation is useless. The policeman supplies an additional fact, but does not claim importance for it. The hasp of the window is visibly unclosed through the glass. But--so the officer testifies--they don't shut 'em to, as often as not.
"You can open it from outside," says the parson-gentleman to the policeman. "All right! I was coming to the house. I know the people."
"All right, officer!" says the doctor-gentleman. "You know me. Dr. Ferris, Cazenove Street." And thus encouraged the constable easily throws up the window from without. A touch on the shutters, and they open inwards. They reveal an empty room, and the track of the footsteps away from the window is at once explained--fully to the two who knew that a delirious man was the only tenant of the room, and clearly enough for purpose of action to the third, who only sees that some person, to whom the exclamation of both at once, "He has escaped!" applied, has been able to close the window behind him to disguise his flight, and may by now be far away at the end of a long trail they all start to follow, running through the snow as best they may. It is difficult to run, as the drifted snow is nearly knee-deep sometimes. But here and there the wind has kept the ground clear, blowing it like dry dust.
The track goes straight to the closing fence at the street end, at a point the youthful marauders of Tallack Street have chosen for inroads into the railway territory beyond. It is passable, for those who can climb a little, and whose clothes do not mind nail-rip or paint-stain. As the three follow one another over this obstacle, Athelstan Taylor and the doctor send back a shouted word or two of reassurance to whoever it is that has opened the house-door and come out with a cry of alarm--woman or child or both. They do not stop to see which, but get on as fast as possible. The track ends for a few yards where the railway arch has made a gap in the snow, but it is soon found on the other side, and then is easy to follow over a desolation of land ripe for building--ripe for the creation of ground-rents--ripe with the deadly ripeness we all know so well, of the land that the hay will never smell sweet upon again, the land that even now awaits interminable streets of dwellings no man or woman of the days to come shall ever think of as a home in childhood. Easy to follow as it lies clear in the thick snow it has had all to itself, and will have till the road is reached that leads to the Refuse Destroyer, with its two hundred feet of chimney-shaft, from which a black cloud is pouring--presumably of refuse that has refused to be destroyed; or has reappeared after destruction in an astral body, or suppose we say disastral--and the canal, and the Breweries, and the Chemical Bottle Stout Works, and the Artificial Food Works the Sewage Appropriation Company, Limited, are building down Snape's Lane this side of the canal-basin.