My position could not have been better chosen. It afforded me a full view, not only of the Obion's mouth, but also of the broad channel into which it emptied--at their confluence, forming an expanse of water that, but for its rolling current; might have been likened to a vast lake. There was moonlight over the whole surface; and the erratic ripples were reflected in sparkling coruscations--scarcely to be distinguished from the gleaming of the "lightning bugs," that hovered in myriads along the hedges of the marsh. Both banks of the lesser stream were draped to the water's edge with an unbroken forest of cotton-woods--the tops of which exhibiting their characteristic softness of outline, were unstirred by the slightest breeze. Between rolled the brown waters of the Obion, in ruder, grander flow, and with channel extended by the freshet. Every inch of it, from side to side, was under my observation--so completely, that I could distinguish the smallest object that might have appeared upon its surface. Not even the tiniest waif could have escaped me--much less a canoe freighted with human beings; and containing that fairer form, that would be certain to secure the keenest and most eager glances of my eye. I congratulated myself on reaching this perch. I perceived that a better post of observation could not have been chosen. It was complete for the purpose; and, if I could only have felt sure that we had arrived in time, all would have been satisfactory. Time alone would determine the point; and, turning my eyes up stream, I entered upon my earnest vigil. CHAPTER THIRTY EIGHT. THE WHITE FOG. Vain vigil it proved. I shall not tire the reader with details. Suffice it to say, that we kept watch till morning's dawn; and then, profiting by the daylight, sought out a more convenient post of observation, where we continued our surveillance--watching and sleeping in turn. Throughout the following day, and into the second, was our vigil extended: until no longer able to hope against hope, we agreed finally to abandon it. But for one circumstance, we might have felt surprise at the result. We were both convinced that we had reached the river's mouth in good time: since, by our calculations, the canoe could not possibly have "headed" us. But for the same circumstance, we might have believed, that they had not yet come down the Obion; and perhaps would have remained at our post a day longer.