and, leaping unnoticed behind the shaggy back, dealt the brute a terrific blow. My plan worked like magic. From the previous slowness of the beast I had been led to look for no such marvelous agility as he now displayed. Releasing his hold upon the tree he dropped on all-fours and at the same time swung his great, wicked tail with a force that would have broken every bone in my body had it struck me; but, fortunately, I had turned to flee at the very instant that I felt my blow land upon the towering back.
As it started in pursuit of me I made the mistake of running along the edge of the forest rather than making for the open beach. In a moment I was knee-deep in rotting vegetation, and the awful thing behind me was gaining rapidly as I floundered and fell in my efforts to extricate myself.
A fallen log gave me an instant's advantage, for climbing upon it I leaped to another a few paces farther on, and in this way was able to keep clear of the mush that carpeted the surrounding ground. But the zigzag course that this necessitated was
