“Do not fire,” said David. “Even if you were to kill the beast we could not get him, and it would be cruel to slaughter him without any object in view. He intends us no harm; we ought to allow him to enjoy the existence the Creator has given him.”

The hippopotami swam by and dived, and presently we saw them rise to the surface with a quantity of weeds in their mouths, which they chewed leisurely as they swam on. The crocodiles meantime crawled up on the bank and lay basking in the sun, enjoying its warmth, and looking at that time, at all events, as if they had no evil intentions. It was a curious scene, and gave us an idea of the vast amount of animal life to be met with in that region.

“I think it would frighten Kate, brave as she is, to see those huge monsters,” said Leo.

“Oh, no,” answered David. “Bella might be somewhat alarmed; but I am sure Kate would be as much interested as we are in witnessing this curious sight. We will get her to come, but warn her beforehand what she is to expect.”

We accordingly hastened back to the camp, but found we had been so long absent that it was now time to proceed; and the bearers taking up their loads, we continued our march. Senhor Silva assured Kate and Bella they need not be disappointed at missing a sight of the flamingoes, as they would have many opportunities of seeing troops of those magnificent birds, which are found in vast numbers throughout that region.

The woods as we proceeded appeared full of life. Birds flitted among the boughs, and monkeys of all sorts sprang here and there, chattering and hooting as we passed. Soon after this we emerged from the wood and entered a beautiful prairie—a natural clearing covered with grass or low shrubs and flowers. As yet we had fallen in with no inhabitants. “Oh, but see!” exclaimed Leo. “There are some huts ahead. Shall we go and pay the people a visit?” The boys ran on. I thought Senhor Silva would have called them back, but he allowed them to proceed. At all events, he knew that if the huts were inhabited, the people were likely to prove friendly. The boys stopped before the seeming huts, and began to examine them. We saw them walking round and round, and they then finally climbed to the top of one of them. After apparently satisfying their curiosity, they came back towards us.

“They are not huts,” exclaimed Natty, “but curious mounds, three or four times as high as we are.”

“What do you say to those mounds or clay-built domes being the houses of ants, and built entirely by themselves?” said Senhor Silva.

As we approached we saw a dozen or more such mounds, scattered about at short distances from each other. Having got to a secure distance from the last, two of our bearers put down their loads, and advancing towards it with the poles they carried, began to attack it with heavy blows, knocking off one of the small turrets on the side. Instantly a white ant was seen to appear through the opening thus made, apparently surveying the damage done. Immediately afterwards, hundreds of other ants came to the spot, each carrying a small lump of clay, with which they began to repair the damage; and even for the short time we remained, they had made some progress. We could discover, however, no outlet or opening in the mound; nor, except at the hole made by our bearers, were any ants seen. We, however, could not remain to watch the progress of the work. Just as we were going, one of our bearers, much to my regret, commenced a still more furious attack on the citadel, exposing the whole centre to view, when it appeared crowded with thousands and tens of thousands—so it seemed—of ants, who issued forth with pincers stretched out, evidently intending to attack us. David caught up one of the ants to examine it; but we were all too glad hurriedly to make our escape. We found the creature, on examining it, to be a quarter of an inch in length, with a flat hard head, terminating in a pair of sharp horizontal pincers, something like the claws of a crab.

Several, who, in spite of our flight, caught hold of us, bit very hard, and did not fail to draw blood. Senhor Silva, as we marched on, gave us a very interesting account of these white ants, with the habits of which he was well acquainted, as he told us he had had one of the mounds cut completely in two, so as to examine the interior. The under part alone of the mound is inhabited by the ants; the upper portion serving as a roof to keep the lower warm and moist for hatching the eggs. His description put me somewhat in mind of the Pyramids of Egypt. The larger portion is solid. In the centre, just above the ground, is the chief cell, the residence of the queen and her husband. Round this royal chamber is found a whole labyrinth of small rooms, inhabited by the soldiers and workmen. The space between them and the outer wall of the building is used partly for store-rooms and partly for the purpose of nurseries. A subterranean passage leads from a distance to the very centre of the building. It is cylindrical, and lined with cement. On reaching under the bottom of the fortress, it branches out in numerous small passages, ascending the outer shell in a spiral manner, winding round the whole of the building to the summit, and intersecting numerous galleries one above the other, full of cells. The outer end of the great gallery, by which the mound is approached, also branches off into numerous small ones, so as to allow a passage into it from various directions. As the ants cannot climb a perpendicular wall without difficulty, all their ascents are gradual. It is through this great passage that they convey the clay, wood, water, and provisions to their colony.