He kept pausing as he spoke, and now and then glanced up the river, as if expecting to see a boat coming round the bend every moment. I was much puzzled by his extraordinary manner. I knew him to be a steady man, and one whose services were much valued by the Conservancy; but it needed only a glance now to show that there was something very much amiss with him.

The darkness was increasing every moment, and, being anxious to get on as soon as possible, I was just going to tell him again to hurry up with the sluices, when he bent down close to me, and said,—

"Would you mind stepping out for a moment, sir, if you can spare the time? I wish to speak to you, sir. I'd be most grateful if you would wait a minute or two."

"Certainly, Jimmy," I answered, hauling myself to the side with the boat-hook, and getting out. "Is there anything I can do for you? I am afraid you are not well. I never saw you like this before."

"No, sir; and I never felt like it before, that I can remember. Something happened here last night that has taken all the nerve out of me, and I want to tell you what it was. I know you are so clever, Mr. Bell, and I have heard about your doings up at Wallinghurst last autumn, when you cleared up the Manor House ghost, and got old Monkford six months."

"Well, fire away," I said, filling my pipe, and wondering what was coming.

"It is this way, sir," he began. "Last night after I had had my supper I thought I'd like a stroll and a quiet smoke along the towing path before turning in. I did not expect any more boats, as it was getting on for ten o'clock. I walked about three-quarters of a mile, and was just going to turn round, when I saw a light down on the surface of the water in mid-stream. It was pretty dark, for the moon was not up yet, and there was a thick white mist rising from the water. I thought it must be some one in a canoe at first, so I waited a bit and watched. Then it suddenly disappeared, and the next instant I saw it again about a hundred yards or so higher up the stream, but only for a second, and then it went out. It fairly puzzled me to know what it could be, as I had never seen anything like it before. I felt sure it wasn't any sort of craft, but I had heard of strange lights being seen at times on the water—what they call jack-o'-lanterns, I believe, sir. I reckoned it might be one of them, but I thought I'd get back to the lock, so that, if it was a canoe, I could let it through. However, nothing came of it, and I waited and watched, and worried all the evening about it, but couldn't come to any sort of idea, so I went to bed. Well, about one o'clock this morning I suddenly woke up and thought I could hear some one a long way off calling exactly as you did just now, 'Lock! lock! lock!' but it sounded ever so far away.

"'It's some of those theatre people coming back to the Will-o'-the-Wisp house-boat,' I said to myself, 'and I'm not going to turn out for them.' The lock was full at the time, so I thought I would just let them work it for themselves. I waited a bit, expecting to hear them every minute come up, singing and swearing as they do, but they never came, and I was just dropping off when I heard the call again. It was not an ordinary sort of voice, but a long, wailing cry, just as if some one was in trouble or drowning. 'Hi! hi! Lock! lo-oock!' it went.

"I got up then and went out. The moon was up now and quite bright, and the mist had cleared off, so I went to the bridge on the upper gates and looked up stream. This is where I was standing, sir, just as we are standing now. I could see right up to the bend, and there was not the sign of a boat. I stood straining my eyes, expecting to see a boat come round every moment, when I heard the cry again, and this time it sounded not fifty yards up stream. I could not make it out at all, so I shouted out as loud as I could, 'Who are you? What's the matter?' but there was no answer; and then suddenly, the next instant, close below me, from inside the lock this time, just here, came a shout, piercing, shrill, and loud, 'Open the lock, quick, quick! Open the lock!'

"I tell you, sir, my heart seemed to stand dead still, and I nearly fell back over the bridge. I wheeled round sharp, but there was nothing in the lock, that I'll swear to my dying day—for I could see all over it, and nothing could have got in there without passing me. The moon was quite bright, and I could see all round it. Without knowing what I was doing, I rushed down like mad to the lower gates, and began to wind up one of the sluices, and then I stood there and waited, but nothing came. As the lock emptied I looked down, but there was no sign of anything anywhere, so I let down the sluice without opening the gates, and then filled up the lock again. I stood by the post, hardly daring to move, when, about half-past five, thank God, I heard the whistle of a tug, and, after seeing her through, it was broad daylight.