Mr. W. B. Baikie writes to the _Athenæum_ from Bida Núpe, Central Africa, in 1862, the following suggestions:--"When I ascended the Niger, now nearly five years ago, I frequently heard allusions to an animal of this nature, but at that time I set it down as a myth. Since then, however, the amount of testimony I have received, and the universal belief of the natives of all the countries which I have hitherto visited, have partly shaken my scepticism, and at present I simply hold that its non-existence is not proven. A skull of this animal is said to be preserved in a town in the country of Bonú, through which I hope to pass in the course of a few weeks, when I shall make every possible inquiry. Two among my informants have repeatedly declared to me that they have seen the bones of this animal, and each made particular mention of the long, straight, or nearly straight, black horn. In countries to the east, and south-east, as Márgi and Bagirmi, where the one-horned rhinoceros is found, the hunters carefully distinguished between it and the supposed Unicorn, and give them different names. In the vast forests and boundless wastes which occur over Central Africa, especially towards the countries south and east of Lake Tsád, Bórnú, Bagirmi and Adamáwa, are doubtless numerous zoological curiosities as yet unknown to the man of science, and among them possibly may exist this much-talked-of, strange, one-horned animal, even though it may not exactly correspond with our typical English Unicorn." The factitious horn has been preserved in various Museums. The "Monocero Horn," in Tradescant's collection, was, probably, that which ordinarily has passed for the horn of the Unicorn, namely, the tooth of a narwhal. Old legends assert that the Unicorn, when he goes to drink, first dips his horn in the water to purify it, and that other beasts delay to quench their thirst till the Unicorn has thus sweetened the water. The narwhal's tooth makes a capital twisted Unicorn's horn, as represented in the old figures. That in the Repository of St. Denis, at Paris, was presented by Thevet, and was declared to have been given to him by the King of Monomotapa, who took him out to hunt Unicorns, which are frequent in that country. Some have thought that this horn was a carved elephant's tooth. There is one at Strasburg, some seven or eight feet in length, and there are several in Venice. Great medical virtues were attributed to the so-called horn, and the price it once bore outdoes everything in the _Tulipomania_. A Florentine physician has recorded that a pound of it (sixteen ounces) was sold in the shops for fifteen hundred and thirty-six crowns, when the same weight in gold would only have brought one hundred and forty-eight crowns.