In Tartary they have an animal called _czigithai_, which possibly is of the same species as the zebra, as the principal difference between them is in the colour; a difference which, we have repeatedly observed, may be occasioned by the varieties of the climates. This czigithai is common in the southern parts of Siberia, Thibet, Dauria, and Tartary. Gerbillan says they are to be met with in the country of the Mongoux and Kakas; that they differ from mules, and cannot be brought to carry burthens. Muller and Gmelin both assert that there are numbers of them in the countries of the Tongusians, who hunt them like other game: that they resemble a bright bay horse, excepting they have long ears, and a tail like a cow. It is probable that if they had compared him with the zebra they would have found a much greater resemblance. In the Petersburgh cabinet there are stuffed skins both of the zebra and czigithai; they differ very much in colour, but yet they may belong to the same, or nearly the same species. Besides there is no other animal in Africa but what is to be found in Asia, and, therefore, if these are different species the zebra alone would stand as an exception to that general rule. If the czigithai does not belong to the zebra species it may possibly be the onagre, or wild ass of Asia; which latter should not by any means be confounded with the zebra. According to all travellers there are various kinds of wild asses, and the onagre is supposed to rank at the head of them. The horse, ass, onagre, and czigithai, may form four distinct species; and if there are but three, it will remain uncertain whether the latter is an onagre or zebra. The onagre is said to exceed the horse in swiftness, and the very same remark is made of the czigithai. Let this particular fact be as it may, the horse, ass, zebra, and czigithai, belong to the same genus, and are only different branches thereof. From the two first being rendered domestic, mankind have received great advantages, and the two last being reduced to a similar state would, no doubt, prove likewise a useful acquisition. THE HIPPOPOTAMUS.