I am a pretty good swimmer as people go, but when one is fully clothed and three parts dazed, a sudden plunge into a dirty dock is apt to prove a trifle disconcerting. I went under completely, and, although I struck out at once with the blind instinct of self-preservation, it was several moments before I managed to struggle back to the surface. Fortunately for me my hat had come off in the fall, and, treading water with frantic energy, I was able to take a hasty survey of my position. Everything was more or less hidden by the mist, but a few yards away I could just make out the black face of the dock wall rising up dimly through the gloom. If I hadn't been hampered by a sopping overcoat I could have covered the distance in two or three strokes. As it was, that cursed garment clung round my legs with a persistency that nearly finished off my career for good and all. Twice I was dragged under again entirely, and it was in a very exhausted state that I at last reached out a hand and grabbed hold of a slimy iron ring that was sticking out of the wall a foot or so above my head. I was so utterly done that I could not have gone another foot. I just clung to this support, shaking the water out of my eyes, and gulping down mouthfuls of fresh air into my half-choked lungs. For all I knew the gentleman who had shoved me in might still be standing on the parapet above waiting to finish me off with a convenient brickbat, but for the moment I was too occupied in getting my breath to worry about him or anything else. As that first feeling of suffocation passed off, however, the full extent of my danger suddenly came home to me. I realised with a sort of dull shock that nothing except the ring stood between me and death. If I once let go my hold I knew that I should sink like a stone, and, giddy and exhausted as I was, I could hardly expect my strength to last out for more than a few minutes. Taking a firmer grip with both hands, I stared up desperately at the face of the wall. There was not much encouragement there, for the six feet of smooth and slippery concrete that met my eyes showed no trace of a crack throughout its entire surface. As far as I could see, I was trapped like a rat in a bucket, and for the first time in my life I felt a numbing chill of despair creeping through my heart. With a last effort I twisted myself round and faced out into the grey void of the dock. "Help!" I shouted at the top of my voice. "Help!" With a staggering unexpectedness that nearly made me let go my grip, an answering hail came back through the mist. "Wot's the matter? Were are you?' "Here!" I sung out frantically. "In the water. Up against the wall." "'Ang on, then," holloaed a gruff, encouraging voice. "'Ang on! mate! I'm a-comin'."