Out of this passage most of the modern Unicorns have been described and figured. The body of the horse and the head of the deer appear to be but vague sketches; the feet of the elephant and the tail of the boar point at once to a pachydermatous (thick-skinned) animal; and the single black horn, allowing for a little exaggeration as to its length, well fits the two last-mentioned conditions, and will apply to the Indian rhinoceros, which, says the sound naturalist, Ogilby, "affords a remarkable instance of the obstructions which the progress of knowledge may suffer, and the gross absurdities which not unfrequently result from the wrong application of a name." Mr. Ogilby then refers to the account of Ctesias, which we have just quoted, and adds:--"His account, though mixed up with a great deal of credulous absurdity, contains a very valuable and perfectly recognisable description of the rhinoceros, under the ridiculous name, however, of the _Indian Ass_; and, as he attributed to it a whole hoof like the horse, and a single horn in the forehead, speculation required but one step further to produce the fabulous Unicorn." The ancient writers who have treated of the Unicorn are too numerous for us to specify. Some of the moderns may be referred to. Garcias describes this marvellous creature from one who alleges that he had seen it. The seer affirmed that it was endowed with a wonderful horn, which it would sometimes turn to the left and right, at others raise, and then again depress. Ludovicus Vartomanus writes, that he saw two sent to the Sultan from Ethiopia, and kept in a repository at Mahomet's tomb in Mecca. Cardan describes the Unicorn as a rare animal, the size of a horse, with hair very like that of a weasel, with the head of a deer, on which one horn grows three cubits in length (a story seldom loses anything in its progress) from the forehead, ample at its lowest part, and tapering to a point; with a short neck, a very thin mane, leaning to one side only, and less on the ear, as those of a young roe. In Jonston's "Historia Naturalis," 1657, we see the smooth-horned solipede, "Wald Esel;" and the digitated and clawed smooth-horned "Meer Wolff," the latter with his single horn erect in the foreground, but with it depressed in the background, where he is represented regaling on serpents. Then there are varieties, with the head, mane, and tail of a horse; another smooth-horned, with a horse's head and mane, a pig's-tail and camel-like feet; the "Meer Stenbock, Capricornus Marinus," with hind webbed feet, and a kind of graduated horn, like an opera-glass pulled out, in the foreground, and charging the fish most valiantly in the water in the distance. Then there is another, with a mule's head and two rhinoceros-like horns, one on his forehead and the other on his nose; and a horse's tail, with a collar round his neck; a neck entirely shaggy--and a twisted horn, a shaggy gorget, and curly tail, are among other peculiarities.