Now to come to the definition of Light, in which the Author is also unsatisfied with the School of _Aristotle_, he saith, It satisfieth him no more to tell him that _Lux est actus perspicui_, than if you should tell him that it is _umbra Dei_. The ground of this definition given by the _Peripateticks_, is taken from a passage in _Aristot. de anima l. 2, cap. 7_, where _Aristotle_ saith, That the colour of the thing seen, doth move that which is _perspicuum actu_ (i.e. _illustratam naturam quæ sit in aere aliove corpore trunsparente_) and that that, in regard of its continuation to the eye, moveth the eye, and by its help the internal _sensorium_; and that so vision is perform'd. Now as it is true that the Sectators of _Aristotle_ are to blame, by fastening upon him by occasion of this passage, that he meant that those things that made this impress upon the Organs are meer accidents, and have nothing of substance; which is more than ever he meant, and cannot be maintained without violence to Reason, and his own Principles; so for _Aristotle_ himself, no man is beholding to him for any Science acquir'd by this definition: for what is any man the near for his telling him that Colour (admitting it to be a body, as indeed it is, and in that place he doth not deny) doth move _actu perspicuum_, when as the perspicuity is in relation to the _eye_; and he doth not say how it comes to be perspicuous, which is the thing enquired after, but gives it that donation before the eye hath perform'd its office; so that if he had said it had been _umbra Dei_, it would have been as intelligible, as what he hath said. He that would be satisfied how Vision is perform'd, let him see Mr. _Hobbs_ in _Tract. de nat. human_, cap. 2. _For God hath not caused it to rain upon the Earth._] St. _Aug. de Genes. ad literam_, cap. 5, 6, salves that expression from any inconvenience; but the Author in _Pseudodox. Epidemic._ l. 7, cap. 1, shews that we have no reason to be confident that this Fruit was an _Apple_. _I believe that the_ Serpent (_if we shall literally understand it_) _from his proper form and figure made his motion on his belly before the curse_.] Yet the Author himself sheweth in _Pseudodox. Epidemic._ lib. 7, cap. 1, that the form or kind of the _Serpent_ is not agreed on: yet _Comestor_ affirm'd it was a _Dragon_, _Eugubinus_ a _Basilisk_, _Delrio_ a _Viper_, and others a common _Snake_: but of what kind soever it was, he sheweth in the same Volume, _lib. 5, c. 4_, that there was no inconvenience, that the temptation should be perform'd in this proper shape. _I find the tryal of Pucelage and the Virginity of Women which God ordained the_ Jews, _is very fallible._] _Locus extat, Deut. c. 22_, the same is affirm'd by _Laurentius_ in his _Anatom._