"But aside from all this, there is the watch; the watch is very important. It may be negative, it is true, but it is nevertheless very convincing. The rope and the twine and the fish line were positive evidence. Not evidence that the murderer owned the farm or farmyard perhaps, but evidence that the articles in question were at that farmyard a considerable time; evidence that the twine was in a hat factory. "Place the rope, twine and fish line in Boyle's possession; place Boyle in a hat factory and you may convince me of his guilt of Miller's murder. Not otherwise." He snapped shut the watch case, with an emphatic click. His brow cleared. "Negative evidence is often very important, is it not? It helps clear one's mind. I think I am beginning to see. What a gorgeous plan it was. Did I say that I took back what I said about the man, responsible for these deaths not being subtle? I did? Well he is subtle, dangerously so." "Do you mean, Professor," Jimmy leaned forward eagerly, "that you know the man who--" "Not so fast young man. I do not know who it is, but I am beginning to think I know who it might be; who it can be. Is that dubious?" His eyes were now gleaming. The three men watching him knew the signs. His small shapely hand was pounding the arm of his chair softly. He became suddenly grave. He spoke to McCall: "Did we hear Flynn say that he told his comrades when he came here that he would have to leave on an important errand today?" McCall and Jimmy nodded. Professor Brierly's gravity became more profound. He sprang to his feet. He said emphatically: "Call New York at once, Mr. McCall. Do not waste a minute. Tell them to take extreme precautions in watching Flynn. I believe Flynn is in the greatest danger. Oh, fool that I am! Why did I not think of it? At once, Mr. McCall, at once." He pounded the table impatiently. As McCall was turning the small crank to ring the operator, Professor Brierly added: "After you've done that, McCall, see if you can get in touch with the train that Flynn took. Warn his guards." When McCall came back to the table looking inquiringly toward the white-headed old scientist, the latter smiled slowly. "Thinking that I am getting into my dotage, young man? Flynn is in deadly danger. I will feel at ease about him only when he gets back here safely. His greatest danger is when he arrives in New York. He is probably safe on board the train but I do not know, I am afraid for him." Jimmy went outside to see to the comfort of his youthful pilot. Harry Stoy had made his bed on the ground near the wharf. He said he liked to sleep outdoors under the sky. When he returned Jimmy took his portable typewriter to his room where he wrote far into the night. The entire household was wrapped in slumber when the telephone bell awoke them with its insistent buzz. McCall, cursing the impulse that had made him install a telephone in this out of the way camp, arose sleepily and took down the receiver.