Could he trace the firm who had made the crate? Of this he was doubtful; it was not sufficiently distinctive. There must be thousands of similar packing cases in existence, and to check up all of them would be out of the question. Besides, it might not have been supplied by a firm. The murderer might have had it specially made or even have made it himself. Here again, however, French could but try.
The second point was: How had the crate got to the bottom of the Burry Inlet? This was a question that he must solve, and he turned all his energies towards it.
There were here two possibilities. Either the crate had been thrown into the water and had sunk at the place where it was found, or it had gone in elsewhere and been driven forward by the action of the sea. He considered these ideas in turn.
To have sunk at the place it was thrown in postulated a ship or boat passing over the site. From the map, steamers approaching or leaving Llanelly must go close to the place, and might cross it. But French saw that there were grave difficulties in the theory that the crate had been dropped overboard from a steamer. It was evident that the whole object of the crate was to dispose of the body secretly. The crate, however, could not have been secretly thrown from a steamer. Whether it were let go by hand or by a winch, several men would know about it. Indeed, news of so unusual an operation would almost certainly spread to the whole crew, and if the crate were afterwards found, some one of the hands would be sure to give the thing away. Further, if the crate were being got rid of from a steamer it would have been done far out in deep water and not at the entrance to a port.
For these reasons French thought that the ship might be ruled out and he turned his attention to the idea of a rowboat.
But here a similar objection presented itself. The crate was too big and heavy to be dropped from a small boat. French tried to visualise the operation. The crate could only be placed across the stern; in any other position it would capsize the boat. Then it would have to be pushed off. This could not be done by one man; he doubted whether it could be done by two. But even if it could, these two added to the weight of the crate would certainly cause disaster. He did not believe the operation possible without a large boat and at least three men, and he felt sure the secret would not have been entrusted to so many.
It seemed to him, then, that the crate could not have been thrown in where it was found. How else could it have got there?
He thought of Mr. Morgan’s suggestion of a wreck from which it might have been washed up into the Inlet, but according to the sergeant, there had been no wreck. Besides, the crate was undamaged outside, and it was impossible that it could have been torn out through the broken side of a ship or washed overboard without leaving some traces.
French lit a fresh pipe and began to pace the deserted smoking room. He was exasperated because he saw that his reasoning must be faulty. All that he had done was to prove that the crate could not have reached the place where it was found.
For some minutes he couldn’t see the snag; then it occurred to him that he had been assuming too much. He had taken it for granted that the crate had sunk immediately on falling into the water. The weights of the crate itself, the body, and the bar of steel had made him think so. But was he correct? Would the air the crate contained not give it buoyancy for a time, until at least some water had leaked in?
If so, the fact would have a considerable bearing on his problem. If the crate had been floated to the place he was halfway to a solution.
Suddenly the possible significance of the fourteen holes occurred to him. He had supposed they were nailholes, but now he began to think differently. Suppose they were placed there to admit the water, slowly, so that the crate should float for a time and then sink? Their position was suggestive: they were at diagonally opposite corners of the crate. That meant that at least one set must be under water, no matter in what position the crate was floating. It also meant that the other set provided a vent for the escape of the displaced air.
The more French thought over the idea, the more probable it seemed. The crate had been thrown into the sea, most likely from the shore and when the tide was ebbing, and it had floated out into the Inlet. By the time it had reached the position in which it was found, enough water had leaked in to sink it.
He wondered if any confirmatory evidence of the theory were available. Then an idea struck him, and walking to the police station, he asked for Sergeant Nield.
“I want you, Sergeant, to give me a bit of help,” he began. “First, I want the weights of the crate and the bar of iron. Can you get them for me?”
“Certainly. We’ve nothing here that would weigh them, but I’ll send them to the railway station. You’ll have the weights in half an hour.”
“Good man! Now there is one other thing. Can you borrow a Molesworth for me?”
“A Molesworth?”
“A Molesworth’s Pocket Book of Engineering Formulae. You’ll get it from any engineer or architect.”
“Yes, I think I can manage that. Anything else?”
“No, Sergeant; that’s all except that before you send away the crate I want to measure those nail holes.”
French took a pencil from his pocket and sharpened it to a long, thin, evenly
