Here was anchored an immense mooring-buoy, with a round, slightly conical top, having in its centre a great iron ring. It did not rise more than a foot from the surface of the water, and in trying to watch Sumner, the occupant of the leading canoe did not notice it until his light craft struck it a glancing blow, and very nearly upset. The next instant an effort to recover his equilibrium had precipitated the fellow into the water, and as Sumner shot past him he was wildly clutching at the buoy, with desperate efforts to gain its upper surface.