"i had come to these conclusions before ever i had entered his room. an inspection of his chair showed me that he had been in the habit of standing on it, which of course would be necessary in order that he should reach the ventilator. the sight of the safe, the saucer of milk, and the loop of whipcord were enough to finally dispel any doubts which may have remained. the metallic clang heard by miss stoner was obviously caused by her stepfather hastily closing the door of his safe upon its terrible occupant. having once made up my mind, you know the steps which i took in order to put the matter to the proof. i heard the creature hiss as i have no doubt that you did also, and i instantly lit the light and attacked it."