Moreover a testimony in points Historical, and where it is of unavoidable use, is of no illation in the negative, nor is it of consequence that _Herodotus_ writing nothing of _Rome_, there was therefore no such City in his time; or because _Dioscorides_ hath made no mention of Unicorns horn, there is therefore no such thing in Nature. Indeed, intending an accurate enumeration of Medical materials, the omission hereof affords some probability, it was not used by the Ancients, but will not conclude the non-existence thereof. For so may we annihilate many Simples unknown to his enquiries, as _Senna_, _Rhubarb_, _Bezoar_, _Ambregris_, and divers others. Whereas indeed the reason of man hath not such restraint; concluding not onely affirmatively but negatively; not onely affirming there is no magnitude beyond the last heavens, but also denying there is any vacuity within them. Although it be confessed, the affirmative hath the prerogative illation, and _Barbara_ engrosseth the powerful demonstration. Lastly, The strange relations made by Authors, may sufficiently discourage our adherence unto Authority; and which if we believe we must be apt to swallow any thing. Thus _Basil_ will tell us, the Serpent went erect like Man, and that that Beast could speak before the Fall. _Tostatus_ would make us believe that _Nilus_ encreaseth every new Moon. _Leonardo Fioravanti_ an Italian Physitian, beside many other secrets, assumeth unto himself the discovery of one concerning Pellitory of the Wall; that is, that it never groweth in the sight of the _North_ star. _Doue si possa vedere la stella Tramontana_, wherein how wide he is from truth, is easily discoverable unto every one, who hath but Astronomy enough to know that Star. _Franciscus Sanctius_ in a laudable Comment upon _Alciats_ Emblems, affirmeth, and that from experience, a Nightingale hath no tongue. _Avem Philomelam lingua carere pro certo affirmare possum, nisi me oculi fallunt._ Which if any man for a while shall believe upon his experience, he may at his leisure refute it by his own. What fool almost would believe, at least, what wise man would relie upon that Antidote delivered by _Pierius_ in his Hieroglyphicks against the sting of a Scorpion? that is, to sit upon an Ass with ones face toward his tail; for so the pain leaveth the Man, and passeth into the Beast. It were methinks but an uncomfortable receit for a Quartane Ague (and yet as good perhaps as many others used) to have recourse unto the _Recipe_ of _Sammonicus_; that is, to lay the fourth Book of _Homers_ Iliads under ones head, according to the precept of that Physitian and Poet, _Mæoniæ Iliados quartum suppone trementi_. [SN: _An eye medicine._] There are surely few that have belief to swallow, or hope enough to experiment the Collyrium of _Albertus_; which promiseth a strange effect, and such as Thieves would count inestimable, that is, to make one see in the dark: yet thus much, according unto his receit, will