Fifthly, Although there be many _Unicorns_, and consequently many Horns, yet many there are which bear that name, and currantly pass among us, which are no Horns at all. Such are those fragments and pieces of _Lapis Ceratites_, commonly termed _Cornu fossile_, whereof _Bœtius_ had no less than twenty several sorts presented him for _Unicorns_ Horn. Hereof in subterraneous cavities, and under the earth there are many to be found in several parts of _Germany_; which are but the lapidescencies and petrifactive mutations of hard bodies; sometimes of Horn, of teeth, of bones, and branches of trees, whereof there are some so imperfectly converted, as to retain the odor and qualities of their originals; as he relateth of pieces of Ash and Walnut. Again, in most, if not all which pass amongst us, and are extolled for precious Horns, we discover not an affection common unto other Horns; that is, they mollifie not with fire, they soften not upon decoction or infusion, nor will they afford a jelly, or mucilaginous concretion in either; which notwithstanding we may effect in Goats horns, Sheeps, Cows and Harts-horn, in the Horn of the _Rhinoceros_, the horn of the Pristis or Sword fish. Nor do they become friable or easily powderable by Philosophical calcination, that is, from the vapor or steam of water, but split and rift contrary to others horns. [SN: Unicorns _Horn commonly used in_ England, _what it is_.] Briefly, many of those commonly received, and whereof there be so many fragments preserved in _England_, are not only no Horn, but a substance harder then a bone, that is, parts of the tooth of a Morse or Sea-horse; in the midst of the solider part contained a curdled grain, which is not to be found in Ivory. This in Northern Regions is of frequent use for hafts of knives or hilts of swords, and being burnt becomes a good remedy for fluxes: but Antidotally used, and exposed for _Unicorns_ Horn, it is an insufferable delusion; and with more veniable deceit, it might have been practised in Harts-horn.