For at that moment we swept round a rather sharp bend in the stream, and I caught a glimpse, at no great distance ahead, of what I thought looked very much like the stern of a canoe projecting from among the trees on our port.  I held up my hand for silence.  We were so near to the scene of action now, that, had we raised a shout, we should instantly have attracted attention and, maybe, have temporarily suspended whatever operations might be proceeding.  But my party was altogether too weak to justify me in incurring any risks; there appeared to be but one life in immediate jeopardy ashore there, whereas any premature alarm might result in the loss of several of the rescuing party, and possibly the complete failure of the expedition.  No, my strongest hope lay in the possibility of effecting a complete surprise; so I hardened my heart, held up my hand to enjoin the most perfect silence, and whispered the coxswain to sheer the boat a little closer to the port bank.  Then, as the boat seemed to have plenty of "way" on her, I ordered the "stroke" to pass the word to lay in the oars noiselessly, and for those in the bows to stand by with the boat-hook and the painter.