I dare say Old Griffin was a kindly man enough, and not very old; and I suppose that the other constable, as known to his family and friends, was not at all the gloomy headsman he appeared to the boys. When he became constable (they had not the least notion how a man became constable) they heard that his rule was to be marked by unwonted severity against the crime of going in swimming inside the corporation line, and so they kept strictly to the letter of the law. But one day some of them found themselves in the water beyond the First Lock, when the constable appeared on the tow-path, suddenly, as if he and his horse had come up out of the ground. He told them that he had got them now, and he ordered them to come along with him; he remained there amusing himself with their tears, their prayers, and then vanished again. Heaven knows how they lived through it; but they must have got safely home in the usual way, and life must have gone on as before. No doubt the man did not realize the torture he put them to; but it was a cruel thing; and I never have any patience with people who exaggerate a child's offence to it, and make it feel itself a wicked criminal for some little act of scarcely any consequence. If we elders stand here in the place of the Heavenly Father towards those younger children of His, He will not hold us guiltless when we obscure for them the important difference between a great and a small misdeed, or wring their souls, fear-clouded as they always are, with a sense of perdition for no real sin. [Illustration: THE SIX-MILE LEVEL.] [Illustration: "HE TOLD THEM THAT HE HAD GOT THEM NOW."] V. THE HYDRAULIC AND ITS RESERVOIRS.--OLD RIVER.