Almost at the same moment, and before I knew what I was holding on by, there came a sound which sent hope and joy into my heart. It was the whimpering whine of Piter, who directly after set up a short yapping kind of bark, and I had a kind of idea that he must be somewhere on the wood-work inside the wheel.

I did not know that he had fallen in at the same time as I; and though once or twice I had heard him whining, I did not realise that he was also in danger; in fact the horrible overwhelming selfishness of the desire for self-preservation had swept away everything but the thought of how I was to get out of my trouble.

Every moment now gave me a little confidence, though it was nearly driven away when, able to see clearly again, I found myself holding on by one of the wooden pocket-like places formed with boards on the outer circumference of the engine—the places in fact into which, when the sluice was opened, the water rushed, and by its weight bore the wheel round.

After a few minutes’ clinging there, beginning to feel numbed and chilled by the cold, I realised that the sun was setting, that the patches of light were higher, and that in a very few minutes the horrors of this place would be increased tenfold by my being plunged in profound darkness.

I dreaded moving, but I knew that the water could not come down upon me unless the sluice was opened, and that was turned off when the men left work, so that the water was saved for the next day, and the wheel ceased to turn. I determined then to try and climb up from pocket to pocket of the wheel and so reach the stone-race at the opening, along which the water poured.

My courage revived at this, and drawing my legs under me I got them upon one of the edges of the pocket beneath the water, raised myself up and caught hold of one higher than I had hold of before, and was about to take a step higher when, to my horror, the huge wheel began to feel the effect of my weight, and gradually the part I held descended.

At the same moment there was a loud splash, a beating of the water, a whining barking noise, and I knew I had shaken Piter off the bar or spoke to which he had been clinging inside.

“Here, Piter; here dog,” I shouted; and he swam round to me, whining piteously and seeming to ask me for help.

This I was able to give him, for, holding tightly with one hand, I got my right arm round him and helped him to scramble up into one of the pockets, though the effort had weighed down the wheel and I sank deeper in the water.

I made another trial to climb up, but though the resistance of the great wheel was sufficient to support me partly it soon began to revolve, and I knew that it would go faster if I tried to struggle up.