The lesson of fear was one which Henderson learned late. He learned it well, however, when the time came. And it was Blackwater Pot that taught him.
Sluggishly, reluctantly, impotently, the spruce logs followed one another round and round the circuit of the great stone pot. The circling water within the pot was smooth and deep and black, but streaked with foam. At one side a gash in the rocky rim opened upon the sluicing current of the river, which rushed on, quivering and seething, to plunge with a roar into the terrific cauldron of the falls. Out of that thunderous cauldron, filled with huge tramplings and the shriek of tortured torrents, rose a white curtain of spray, which every now and then swayed upward and drenched the green birches which grew about the rim of the pot. For the break in the rim, which caught at the passing current and sucked it into the slow swirls of Blackwater Pot, was not a dozen feet from the lip of the falls.
Henderson sat at the foot of a ragged white birch which leaned from the upper rim of the pot. He held his pipe unlighted, while he watched the logs with a half-fascinated stare. Outside, in the river, he saw them in a clumsy panic haste, wallowing down the white rapids to their awful plunge. When a log came close along shore its fate hung for a second or two in doubt. It might shoot straight on, over the lip, into the wavering curtain of spray and vanish into the horror of the cauldron. Or, at the last moment, the eddy might reach out stealthily and drag it into the sullen wheeling procession within the pot. All that it gained here, however, was a terrible kind of respite, a breathing-space of agonized suspense. As it circled around, and came again to the opening by which it had entered, it might continue on another eventless revolution, or it might, according to the whim of the eddy, be cast forth once more, irretrievably, into the clutch of the awful sluice. Sometimes two logs, after a pause in what seemed like a secret death-struggle, would crowd each other out and go over the falls together. And sometimes, on the other hand, all would make the circuit safely again and again. But always, at the cleft in the rim of the pot, there was the moment of suspense, the shuddering, terrible panic.