_Wind_ and _Fire_ have some resemblance in some of their particular actions: as for example, Wind and Fire endeavour the disturbance of other Creatures, occasioning a separating and disjoining of Parts. Also, Wind is both an Enemy and Friend to Fire: for Wind, in some sorts of its actions, will assist Fire; and in other actions, dissipates Fire, nay, blows it out: but certainly, the powerful Forces of Wind, proceed not so much from Solidity, as Agility: for, soft, weak, quick Motions, are far more powerful, than strong, slow Motions; because, quick Replies are of great Force, as allowing no time of respit. But this is to be observed, That Wind hath some watry Effects: for, the further water flows, the weaker and fainter it is: so the Wind, the further it blows, the weaker and fainter it is. But this is to be observed, That according to the agilness or slowness of the Corporeal Motions; or, according to the number; or, according to the manner of the compositions, or joynings, or divisions; or, according to the regularity or irregularity of the Corporeal Figurative Motions, so are the Effects. CHAP. XXVII. Of LIGHT. Water, Air, Fire, and Light; are all Rare and Fluid Creatures; but they are of different sorts of Rarities and Fluities: and, though Light seems to be extreamly Rare and Fluid; yet, Light is not so Rare and Fluid, as pure Air is, because it is subject to that sort of Human Perception we name _Sight_; but yet, it is not subject to any of the other Perceptions: and, pure Air is only subject to the Perception of Respiration, which seems to be a more subtil Perception than Sight; and that occasions me to believe, That Air is more Rare and Pure, than Light: but howsoever, I conceive the Figurative Motions of Light, to be extraordinary even, smooth, agil Lines of Corporeal Motions: but, as I said before, there are many sorts of Lights that are not Elemental Lights; as, Glow-worms Tails, Cats Eyes, Rotten Wood, Fish Bones, and that Human Light which is made in Dreams, and Infinite other Lights, not subject to our Perception: which proves, That Light may be without Heat. But, whether the Light of the Sun, which we name _Natural Light_, is naturally hot, may be a dispute: for, many times, the Night is hotter than the Day. CHAP. XXVIII. Of DARKNESS.