We found that many elephants had been feeding on the fruit called Mokoronga.  This is a black-colored plum, having purple juice.  We all ate it in large quantities, as we found it delicious.  The only defect it has is the great size of the seed in comparison with the pulp.  This is the chief fault of all uncultivated wild fruits.  The Mokoronga exists throughout this part of the country most abundantly, and the natives eagerly devour it, as it is said to be perfectly wholesome, or, as they express it, “It is pure fat,” and fat is by them considered the best of food.  Though only a little larger than a cherry, we found that the elephants had stood picking them off patiently by the hour.  We observed the footprints of a black rhinoceros (’Rhinoceros bicornis’, Linn.) and her calf.  We saw other footprints among the hills of Semalembue, but the black rhinoceros is remarkably scarce in all the country north of the Zambesi.  The white rhinoceros (’Rhinoceros simus’ of Burchell), or Mohohu of the Bechuanas, is quite extinct here, and will soon become unknown in the country to the south.  It feeds almost entirely on grasses, and is of a timid, unsuspecting disposition:  this renders it an easy prey, and they are slaughtered without mercy on the introduction of fire-arms.  The black possesses a more savage nature, and, like the ill-natured in general, is never found with an ounce of fat in its body.  From its greater fierceness and wariness, it holds its place in a district much longer than its more timid and better-conditioned neighbor.  Mr. Oswell was once stalking two of these beasts, and, as they came slowly to him, he, knowing that there is but little chance of hitting the small brain of this animal by a shot in the head, lay expecting one of them to give his shoulder till he was within a few yards.  The hunter then thought that by making a rush to his side he might succeed in escaping, but the rhinoceros, too quick for that, turned upon him, and, though he discharged his gun close to the animal’s head, he was tossed in the air.  My friend was insensible for some time, and, on recovering, found large wounds on the thigh and body:  I saw that on the former part still open, and five inches long.  The white, however, is not always quite safe, for one, even after it was mortally wounded, attacked Mr. Oswell’s horse, and thrust the horn through to the saddle, tossing at the time both horse and rider.  I once saw a white rhinoceros give a buffalo, which was gazing intently at myself, a poke in the chest, but it did not wound it, and seemed only a hint to get out of the way.  Four varieties of the rhinoceros are enumerated by naturalists, but my observation led me to conclude that there are but two, and that the extra species have been formed from differences in their sizes, ages, and the direction of the horns, as if we should reckon the short-horned cattle a different species from the Alderneys or the Highland breed.  I was led to this from having once seen a black rhinoceros