In our world the hippopotami are very fond of freshwater rivers. There is a large stream called the Aoe, the waters of which have a peculiar attraction for these beasts, and I have seen it covered with them for miles. The waters of this river are very prejudicial to man; perhaps the qualities which make them agreeable to the beast render them antipathetic to man's constitution. In their native state, the beasts like the land as much as the water, preferring it indeed during the prevalence of certain winds. I could tell, by the direction of these, whether few or many of the animals would come ashore. From my observatory, I have seen thousands together a long way off, looking like countless swarms of flies, and all moving in a compact mass, as though they were gregarious to the highest degree. When seen from a short distance, they look like a moving lead-colour bog. I have sent to caution the hunters, for on occasion the large herds are dangerous. HABITS. There are times when the hippopotami seek to be invisible; they then bury themselves in the sand, and not one can be seen. At other times, miles of country are covered with them. When the wind is in a particular quarter it causes a remarkable musical sound in its passage through the hollow rocks, which seems particularly sympathetic to the hippopotami. If, at the time the "musical sound" is heard, the sun shines, they with great rapidity place the young ones together, running round them as round a central point in a succession of circles. They jump and bound, pass and repass each other, and as it were dance with joy, in a state of great excitement continuing their energetic gambols all the time the musical sound is heard, until, exhausted with their exertions, they lie down and sleep. It is a grand sight to see large herds of hippopotami so joyfully excited. They never act thus when stimulated by fear, but stand doggedly for some time, as though examining the cause of the disturbance, and as soon as the terror has mastered them they rush away, running at a great speed. When they pair, they are generally constant to each other, and the female usually remains at the side of her mate: but some are capricious, and go about as if seeking other males of the herd. When the female is thus inconstant, her partner, after a time, tries to destroy her and her young, though pains are taken to prevent this result. To save the female and her young, we have occasionally been obliged to kill the male with arrows steeped in a poison so powerful, that the slightest graze will cause instant death.