For what happened at 2.35 we have the testimony of the priest, a young, intelligent, and well-educated person; of Patrolman William J. Monohan of the Central Station, an officer of the highest reliability who had paused at that part of his beat to inspect the crowd; and of most of the seventy-eight men who had gathered around the church's high bank wall—especially those in the square where the eastward façade was visible. Of course there was nothing which can be proved as being outside the order of Nature. The possible causes of such an event are many. No one can speak with certainty of the obscure chemical processes arising in a vast, ancient, ill-aired, and long-deserted building of heterogeneous contents. Mephitic vapours—spontaneous combustion—pressure of gases born of long decay—any one of numberless phenomena might be responsible. And then, of course, the factor of conscious charlatanry can by no means be excluded. The thing was really quite simple in itself, and covered less than three minutes of actual time. Father Merluzzo, always a precise man, looked at his watch repeatedly.