The dark mass approached. It hung low and appeared to be but a few hundred feet from the ground. Mingling with the sound of the wind was heard a peculiar rustling, which seemed to proceed from the cloud itself. At this moment, above the cloud against the sky, appeared thousands of black specks, fluttering up and down, plunging in and out, and breaking the distinctness of the outline. "What are those moving specks of black?" asked Sir John. "They are vultures, eagles, falcons, and kites," answered Mokoum, "from afar they have followed the cloud, and will never leave it until it is destroyed or dispersed." "But the cloud?" "Is not a cloud at all," answered the bushman, extending his hand towards the sombre mass, which by this time had spread over a quarter of the sky. "It is a living host; to say the truth, it is a swarm of locusts." The hunter was not mistaken. The Europeans were about to witness one of those terrible invasions of grasshoppers which are unhappily too frequent, and in one night change the most fertile country into an arid desert. These locusts, now arriving by millions, were the "grylli devastorii" of the naturalists, and travellers have seen for a distance of fifty miles the beach covered with piles of these insects to the height of four feet. "Yes," continued the bushman, "these living clouds are a true scourge to the country, and it will be lucky if we escape without harm." "But we have no crops and pasturages of our own," said the Colonel; "what have we to fear?" "Nothing, if they merely pass over our heads; every thing, if they settle on the country over which we must travel. They will not leave a leaf on the trees, nor a blade of grass on the ground; and you forget, Colonel, that if our own sustenance is secure, that of our animals is not. What do you suppose will become of us in the middle of a devastated district?" The astronomers were silent for a time, and contemplated the animated mass before them. The cries of the eagles and falcons, who were devouring the insects by thousands, sounded above the redoubled murmur. "Do you think they will settle here?" said Emery. "I fear so," answered Mokoum, "the wind carries them here direct. The sun is setting, and the fresh evening breeze will bear them down; should they settle on the trees, bushes, and prairies, why, then I tell you----;" but the bushman could not finish his sentence. In an instant the enormous cloud which overshadowed them settled on the ground. Nothing could be seen as far as the horizon but the thickening mass. The camp was bestrewed; waggons and tents alike were veiled beneath the living hail. The Englishmen, moving knee-deep in the insects, crushed them by hundreds at every step.