We started early one morning with small axes and sharp machetes, and single file, began to cut and hew and tear a narrow trail southward. For some distance we found almost a pure culture of the cecropia trees, through which we made rapid progress which aroused entirely false hopes. It was a joy to crash obliquely through the crisp hollow stems at one blow from our great knives. The second man cut again at the base and the rest took the severed stems and threw or pushed them to one side, cutting away any smaller growths. We soon learned to be careful in handling the stems for they were sanctuary for scores of a small stinging ant, whose race had practiced preparedness for many generations and who rushed out when the stem was split by cutlass or ax. As we went on we learned that differences in soil which were not apparent when the great jungle covered everything, had now become of much importance. On high sandy spots the cecropias did not get that flying start which they needed for their vertical straightaway dash. Here a community of hollow reeds or bamboo grass appeared from no one knows where. They had grown and multiplied until their stems fairly touched one another, forming a dense, impenetrable thicket of green, silicious tubes eight to twelve feet in length. These were smooth and hard as glass and tapered beautifully, making wonderfully light and strong arrows with which our Akawai Indians shot fish. Slow indeed was our progress through this. The silica dulled and chipped our blades and the sharp points of the cut stems lamed us at a touch. But whatever the character of the vegetation, whether a tangle of various thorny nightshades, a grove of cecropias, or a serried phalanx of reeds, the terrible razor-grass overran all. Gracefully it hung in emerald loops from branch to branch, festooning living foliage and dead stump alike, with masses of slender fronds. It appeared soft and loose-hung as if one could brush it away with a sweep of the hand. But it was the most punishing of all living things, insidiously cutting to the bone as we grasped it, and binding all this new growth together with bands more efficient than steel. An age-old jungle is kind to the intruder, its floor is smooth and open, one's footsteps fall upon soft moss, the air is cooled and shadowed by the foliage high overhead. Here, in this mushroom growth of only three years, our progress became slower and ever more difficult. Our hands bled and were cut until we could barely keep them gripped about the cutlass handles; our trail opened up a lane down which poured the seething heat of the sun's direct rays; thorns penetrated our moccasins and ants dropped down our necks and bit and stung simultaneously with opposite ends of their anatomy. Five minutes' chopping and hacking was all that the leader could stand, who would then give way to another. Fifty yards of a narrow lane represented our combined efforts the first day.