"Then how, in your opinion, was the crime committed? What, in your opinion, was the weapon used?" he asked. "At present I am unable to say," I responded. "The natural conclusion is that it was caused by a blow from a life-preserver, yet a round knob could never have inflicted such a wound. I incline to the opinion that the wound might have been caused by a fall from the bridge upon the rough stones below." By the aid of my probe I satisfied myself that the bone was not fractured, as it would have been by a deliberate blow dealt from behind. The nature of the wound, indeed, was very much as if it had been caused by the unfortunate man's head coming into contact with some sharp stone. Then, after very careful investigation, lasting over half an hour, during which I took a number of accurate measurements which might be used later in the identification of the weapon, I came to the rather vague conclusion that the crime had been committed not by a blow, but by hurling the victim from the little bridge below which he had been found. "Do you believe that death was instantaneous?" "I am not certain," I responded. "There is no injury to the spinal column which could have caused death. He was, without doubt, pinioned from behind, at the moment he had crossed the foot-bridge, and thrown backward, rolling down the bank into the lake." "His shirt-stud has gone," remarked the detective. "That looks like robbery." "I don't think so," I answered. "Why not?" "Well, do you notice a long green mark there?" I said, pointing to the limp shirt-front. "You see that it runs straight across the stud-hole. By that mark I feel assured there was no robbery." "I see the mark," Bullen answered, "but at the same time, I don't quite see your argument." "That mark was made by a damp branch or bramble. When he fell he tumbled backward into the bushes, and, crashing through them, rolled into the water. One of the branches caught his shirt-stud and broke it out. If you have a strict search made you will find it somewhere near where he fell. His watch and chain and ring are still upon him, you will notice." "I quite understand your theory," he responded. "I will order active search to be made, for it is an important point whether the murder was done by thieves whom he discovered upon his property. It might have been that burglars were lurking there, and, being disturbed by him, they killed him in order to prevent an alarm being raised." "I scarcely think that," I argued. "If they were burglars they would not have attacked him from behind without any ulterior motive. They would have remained in hiding." "But how do you account for him wandering about the park at that hour?" asked the detective. "That point can only be cleared up by his widow," I exclaimed. "I think we should see Mrs Chetwode without delay." With this suggestion he agreed, and having rearranged the body, I left it to the police surgeon to make his post-mortem.