Burl reached the farther side of the plain and found himself threading the aisles of one of the fungus forests in which the growths were hideous, misshapen travesties upon the trees they had supplanted. Bloated, yellow limbs branched off from rounded, swollen trunks. Here and there a pear-shaped puff-ball, Burl's height and half as much again, waited craftily until a chance touch should cause it to shoot upward a curling puff of infinitely fine dust. Burl went cautiously. There were dangers here, but he moved forward steadily, none the less. A great mass of edible mushroom was slung under one of his arms, and from time to time he broke off a fragment and ate of it, while his large eyes searched this way and that for threats of harm. Behind him, a high, shrill roaring had grown slightly in volume and nearness, but was still too far away to impress Burl. The army ants were working havoc in the distance. By thousands and millions, myriads upon myriads, they were foraging the country, clambering upon every eminence, descending into every depression, their antennae waving restlessly and their mandibles forever threateningly extended. The ground was black with them, each was ten inches and more in length. A single such creature would be formidable to an unarmed and naked man like Burl, whose wisest move would be flight, but in their thousands and millions they presented a menace from which no escape seemed possible. They were advancing steadily and rapidly, shrill stridulations and a multitude of clickings marking their movements. The great helpless caterpillars upon the giant cabbages heard the sound of their coming, but were too stupid to flee. The black multitudes covered the rank vegetables, and tiny but voracious jaws began to tear at the flaccid masses of flesh. Each creature had some futile means of struggling. The caterpillars strove to throw off their innumerable assailants by writhings and contortions, wholly ineffective. The bees fought their entrance to the gigantic hives with stings and wingbeats. The moths took to the air in helpless blindness when discovered by the relentless throngs of small black insects which reeked of formic acid and left the ground behind them denuded in every living thing. Before the oncoming horde was a world of teeming life, where mushrooms and fungi fought with thinning numbers of giant cabbages for foothold. Behind the black multitude was--nothing. Mushrooms, cabbages, bees, wasps, crickets. Every creeping and crawling thing that did not get aloft before the black tide reached it was lost, torn to bits by tiny mandibles. Even the hunting spiders and tarantulas fell before the host of insects, having killed many in their final struggles, but overwhelmed by sheer numbers. And the wounded and dying army ants made food for their sound comrades.