That therefore an _Ostrich_ will swallow and take down Iron, is easily to be granted: that oftimes it pass entire away, if we admit of ocular testimony not to be denied. And though some experiment may also plead, that sometimes they are so altered, as not to be found or excluded in any discernable parcels: yet whether this be not effected by some way of corrosion, from sharp and dissolving humidities, rather then any proper digestion, chilifactive mutation, or alimental conversion, is with good reason doubted. CHAPTER XXIII Of Unicorns Horn. Great account and much profit is made of _Unicorns horn_, at least of that which beareth the name thereof; wherein notwithstanding, many I perceive suspect an Imposture, and some conceive there is no such Animal extant. Herein therefore to draw up our determinations; beside the several places of Scripture mentioning this Animal (which some may well contend to be only meant of the Rhinoceros [SN: _Some doubt to be made what_ ראם _signifieth in Scripture_.]) we are so far from denying there is any _Unicorn_ at all, that we affirm there are many kinds thereof. In the number of Quadrupedes, we will concede no less then five; that is, the _Indian_ Ox, the _Indian_ Ass, the Rhinoceros, the Oryx, and that which is more eminently termed _Monoceros_, or _Unicornis_. Some of the list of fishes; as that described by _Olaus_, _Albertus_ and others: and some Unicorns we will allow even among Insects; as those four kinds of nasicornous Beetles described by _Muffetus_.