On the Nature of Things

Since to the varied things assigned be The many pores, those pores must be diverse In nature one from other, and each have Its very shape, its own direction fixed. And so, indeed, in breathing creatures be The several senses, of which each takes in Unto itself, in its own fashion ever, Its own peculiar object. For we mark How sounds do into one place penetrate, Into another flavours of all juice, And savour of smell into a third. Moreover, One sort through rocks we see to seep, and, lo, One sort to pass through wood, another still Through gold, and others to go out and off Through silver and through glass. For we do see Through some pores form-and-look of things to flow, Through others heat to go, and some things still To speedier pass than others through same pores. Of verity, the nature of these same paths, Varying in many modes (as aforesaid) Because of unlike nature and warp and woof Of cosmic things, constrains it so to be. Wherefore, since all these matters now have been Established and settled well for us As premises prepared, for what remains 'Twill not be hard to render clear account By means of these, and the whole cause reveal Whereby the magnet lures the strength of iron. First, stream there must from off the lode-stone seeds Innumerable, a very tide, which smites By blows that air asunder lying betwixt The stone and iron.

And when is emptied out This space, and a large place between the two Is made a void, forthwith the primal germs Of iron, headlong slipping, fall conjoined Into the vacuum, and the ring itself By reason thereof doth follow after and go Thuswise with all its body. And naught there is That of its own primordial elements More thoroughly knit or tighter linked coheres Than nature and cold roughness of stout iron. Wherefore, 'tis less a marvel what I said, That from such elements no bodies can From out the iron collect in larger throng And be into the vacuum borne along, Without the ring itself do follow after. And this it does, and followeth on until 'Thath reached the stone itself and cleaved to it By links invisible. Moreover, likewise, The motion's assisted by a thing of aid (Whereby the process easier becomes),— Namely, by this: as soon as rarer grows That air in front of the ring, and space between Is emptied more and made a void, forthwith It happens all the air that lies behind Conveys it onward, pushing from the rear. For ever doth the circumambient air Drub things unmoved, but here it pushes forth The iron, because upon one side the space Lies void and thus receives the iron in. This air, whereof I am reminding thee, Winding athrough the iron's abundant pores So subtly into the tiny parts thereof, Shoves it and pushes, as wind the ship and sails. The same doth happen in all directions forth:

From whatso side a space is made a void, Whether from crosswise or above, forthwith The neighbour particles are borne along Into the vacuum; for of verity, They're set a-going by poundings from elsewhere, Nor by themselves of own accord can they Rise upwards into the air. Again, all things Must in their framework hold some air, because They are of framework porous, and the air Encompasses and borders on all things. Thus, then, this air in iron so deeply stored Is tossed evermore in vexed motion, And therefore drubs upon the ring sans doubt And shakes it up inside....

In sooth, that ring is thither borne along To where 'thas once plunged headlong—thither, lo, Unto the void whereto it took its start. It happens, too, at times that nature of iron Shrinks from this stone away, accustomed By turns to flee and follow. Yea, I've seen Those Samothracian iron rings leap up, And iron filings in the brazen bowls Seethe furiously, when underneath was set The magnet stone. So strongly iron seems To crave to flee that rock. Such discord great Is gendered by the interposed brass, Because, forsooth, when first the tide of brass Hath seized upon and held possession of The iron's open passage-ways, thereafter Cometh the tide of the stone, and in that iron Findeth all spaces full, nor now hath holes To swim through, as before. 'Tis thus constrained With its own current 'gainst the iron's fabric To dash and beat; by means whereof it spues Forth from itself—and through the brass stirs up— The things which otherwise without the brass It sucks into itself. In these affairs Marvel thou not that from this stone the tide Prevails not likewise other things to move With its own blows: for some stand firm by weight, As gold; and some cannot be moved forever, Because so porous in their framework they That there the tide streams through without a break, Of which sort stuff of wood is seen to be. Therefore, when iron (which lies between the two) Hath taken in some atoms of the brass, Then do the streams of that Magnesian rock Move iron by their smitings.

Yet these things Are not so alien from others, that I Of this same sort am ill prepared to name Ensamples still of things exclusively To one another adapt. Thou seest, first, How lime alone cementeth stones: how wood Only by glue-of-bull with wood is joined— So firmly too that oftener the boards Crack open along the weakness of the grain Ere ever those taurine bonds will lax their hold. The vine-born juices with the water-springs Are bold to mix, though not the heavy pitch With the light oil-of-olive. And purple dye Of shell-fish so uniteth with the wool's Body alone that it cannot be ta'en Away forever—nay, though thou gavest toil To restore the same with the Neptunian flood, Nay, though all ocean willed to wash it out With all its waves. Again, gold unto gold Doth not one substance bind, and only one? And is not brass by tin joined unto brass? And other ensamples how many might one find! What then? Nor is there unto thee a need Of such long ways and roundabout, nor boots it For me much toil on this to spend. More fit It is in few words briefly to embrace Things many: things whose textures fall together So mutually adapt, that cavities To solids correspond, these cavities Of this thing to the solid parts of that, And those of that to solid parts of this— Such joinings are the best. Again, some things Can be the one with other coupled and held, Linked by hooks and eyes, as 'twere; and this Seems more the fact with iron and this stone.

Now, of diseases what the law, and whence The Influence of bane upgathering can Upon the race of man and herds of cattle Kindle a devastation fraught with death, I will unfold. And, first, I've taught above That seeds there be of many things to us Life-giving, and that, contrariwise, there must Fly many round bringing disease and death. When these have, haply, chanced to collect And to derange the atmosphere of earth, The air becometh baneful. And, lo, all That Influence of bane, that pestilence, Or from Beyond down through our atmosphere, Like clouds and mists, descends, or else collects From earth herself and rises, when, a-soak And beat by rains unseasonable and suns, Our earth hath then contracted stench and rot. Seest thou not, also, that whoso arrive In region far from fatherland and home Are by the strangeness of the clime and waters Distempered?—since conditions vary much. For in what else may we suppose the clime Among the Britons to differ from Aegypt's own (Where totters awry the axis of the world), Or in what else to differ Pontic clime From Gades' and from climes adown the south, On to black generations of strong men With sun-baked skins? Even as we thus do see Four climes diverse under the four main-winds And under the four main-regions of the sky, So, too, are seen the colour and face of men Vastly to disagree, and fixed diseases To seize the generations, kind by kind: There is the elephant-disease which down In midmost Aegypt, hard by streams of Nile, Engendered is—and never otherwhere. In Attica the feet are oft attacked, And in Achaean lands the eyes.

And so The divers spots to divers parts and limbs Are noxious; 'tis a variable air That causes this. Thus when an atmosphere, Alien by chance to us, begins to heave, And noxious airs begin to crawl along, They creep and wind like unto mist and cloud, Slowly, and everything upon their way They disarrange and force to change its state. It happens, too, that when they've come at last Into this atmosphere of ours, they taint And make it like themselves and alien. Therefore, asudden this devastation strange, This pestilence, upon the waters falls, Or settles on the very crops of grain Or other meat of men and feed of flocks. Or it remains a subtle force, suspense In the atmosphere itself; and when therefrom We draw our inhalations of mixed air, Into our body equally its bane Also we must suck in. In manner like, Oft comes the pestilence upon the kine, And sickness, too, upon the sluggish sheep. Nor aught it matters whether journey we To regions adverse to ourselves and change The atmospheric cloak, or whether nature Herself import a tainted atmosphere To us or something strange to our own use Which can attack us soon as ever it come.