But they disappear like persons in a dream, and their fishing-time vanishes with them, and the swimming-time is in full possession of the river, and of all the other waters of the Boy's Town. The river, the Canal Basin, the Hydraulic and its Reservoirs, seemed all full of boys at the same moment; but perhaps it was not the same, for my boy was always in each place, and so he must have been there at different times. Each place had its delights and advantages, but the swimming-holes in the river were the greatest favorites. He could not remember when he began to go into them, though it certainly was before he could swim. There was a time when he was afraid of getting in over his head; but he did not know just when he learned to swim, any more than he knew when he learned to read; he could not swim, and then he could swim; he could not read, and then he could read; but I dare say the reading came somewhat before the swimming. Yet the swimming must have come very early, and certainly it was kept up with continual practice; he swam quite as much as he read; perhaps more. The boys had deep swimming-holes and shallow ones; and over the deep ones there was always a spring-board, from which they threw somersaults, or dived straight down into the depths, where there were warm and cold currents mysteriously interwoven. They believed that these deep holes were infested by water-snakes, though they never saw any, and they expected to be bitten by snapping-turtles, though this never happened. Fiery dragons could not have kept them out; gallynippers, whatever they were, certainly did not; they were believed to abound at the bottom of the deep holes; but the boys never stayed long in the deep holes, and they preferred the shallow places, where the river broke into a long ripple (they called it riffle) on its gravelly bed, and where they could at once soak and bask in the musical rush of the sunlit waters. I have heard people in New England blame all the Western rivers for being yellow and turbid; but I know that after the spring floods, when the Miami had settled down to its summer business with the boys, it was as clear and as blue as if it were spilled out of the summer sky. The boys liked the riffle because they could stay in so long there, and there were little landlocked pools and shallows, where the water was even warmer, and they could stay in longer. At most places under the banks there was clay of different colors, which they used for war-paint in their Indian fights; and after they had their Indian fights they could rush screaming and clattering into the riffle. When the stream had washed them clean down to their red sunburn or their leathern tan, they could paint up again and have more Indian fights.