Vapour and Smoak are both fluid Bodies: but, Smoak is more of the Nature of Oyl, than Water; and Vapour more of the Nature of Water, than Oyl; they are dividable: and may be join'd, as other Elements: also, they are of a Metamorphosing Nature, as to change and rechange; but, when they are Metamorphosed into the form of Air, that Air is a gross Air, and is, as we say, a corruptible Air. As for Vapour, it is apt to turn into Wind: for, when it is rarified beyond the Nature of Vapour, and not so much as into the Nature of Air, it turns into some sorts of Wind. I say, some sorts: and certainly, the strongest Winds are made of the grossest Vapours. As for Smoak, it is apt to turn into some sorts of Lightning; I say, apt: for, both Vapour and Smoak can turn into many sorts of Metamorphosed Elements. As for Wind, it proceeds either from Rarified Vapour, or Contracted Air. And there are many sorts of Vapours, Smoaks, and Winds; all which sorts of Vapours and Smoaks, are apt to ascend: but, Wind is of a more level action. As for Clouds, they cannot be composed of a Natural Air; because Natural Air is too rare a Body to make Clouds. Wherefore, Clouds are composed of Vapour and Smoak: for, when Vapour and Smoak ascends up high without transformation, they gather into Clouds, some higher, some lower, according to their purity: for, the purer sort (as I may say for expression-sake) ascends the highest, as being the most agil. But, concerning the Figurative Motions of Vapour and Smoak, they are Circles; but of Winds, they are broken Parts of Circular Vapours: for, when the Vaporous Circle is extended beyond its Nature of Vapour, the Circumference of the Circle breaks into perturbed Parts; and if the Parts be small, the wind is, in our perception, sharp, pricking, and piercing: but, if the Parts are not so small, then the wind is strong and pressing: but wind, being rarified Vapour, is so like Air, as it is not perceived by human sight, though it be perceived by human touch. But, as there are hot vapours, cold vapours, sharp vapours, moist vapours, dry vapours, subtil vapours, and the like; so there is such sorts of winds. But, pray do not mistake me, when I say, that some sorts of winds are broken and perturbed Circles, as if I meant, such as those of Lightning: for, those of Lightning, are extended beyond the degree of Air; and those of Vapours, are not extended to the degree of Air: also, those of Lightning, are not perturbed; and those of Wind, are perturbed. Again, those of Lightning, flow in Streams of smooth, small, even Lines; those of Wind, in disordered Parts and Fragments.
[CHAP. XXVI. Of WIND.]
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.]
The Figurative Motions of Light and Darkness, are quite opposite; and the Figurative Motions of Colours, are as a Mean between both, being partly of the Nature of both: but, as the Figurative Motions of Light, in my opinion, are rare, straight, equal, even, smooth Figurative Motions: those of Darkness are uneven, ruff, or rugged, and more dense. Indeed, there is as much difference between Light and Darkness, as between Earth and Water; or rather, between Water and Fire; because each is an Enemy to other; and, being opposite, they endeavour to out-power each other. But this is to be noted, That Darkness is as visible to Human Perception, as Light; although the Nature of Darkness is, To obscure all other Objects besides it self: but, if Darkness could