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Beyond a doubt； fact plain to sense declares：
To wit； at such a time the densed clouds
So mass themselves through all the upper air
That we might think that round about all murk
Had parted forth from Acheron and filled
The mighty vaults of sky… so grievously；
As gathers thus the storm…clouds' gruesome might；
Do faces of black horror hang on high…
When tempest begins its thunderbolts to forge。
Besides； full often also out at sea
A blackest thunderhead； like cataract
Of pitch hurled down from heaven； and far away
Bulging with murkiness； down on the waves
Falls with vast uproar； and draws on amain
The darkling tempests big with thunderbolts
And hurricanes； itself the while so crammed
Tremendously with fires and winds； that even
Back on the lands the people shudder round
And seek for cover。 Therefore； as I said；
The storm must be conceived as o'er our head
Towering most high； for never would the clouds
O'erwhelm the lands with such a massy dark；
Unless up…builded heap on lofty heap；
To shut the round sun off。 Nor could the clouds；
As on they come； engulf with rain so vast
As thus to make the rivers overflow
And fields to float； if ether were not thus
Furnished with lofty…piled clouds。 Lo； then；
Here be all things fulfilled with winds and fires…
Hence the long lightnings and the thunders loud。
For； verily； I've taught thee even now
How cavernous clouds hold seeds innumerable
Of fiery exhalations； and they must
From off the sunbeams and the heat of these
Take many still。 And so； when that same wind
（Which； haply； into one region of the sky
Collects those clouds） hath pressed from out the same
The many fiery seeds； and with that fire
Hath at the same time inter…mixed itself；
O then and there that wind； a whirlwind now；
Deep in the belly of the cloud spins round
In narrow confines； and sharpens there inside
In glowing furnaces the thunderbolt。
For in a two…fold manner is that wind
Enkindled all： it trembles into heat
Both by its own velocity and by
Repeated touch of fire。 Thereafter； when
The energy of wind is heated through
And the fierce impulse of the fire hath sped
Deeply within； O then the thunderbolt；
Now ripened； so to say； doth suddenly
Splinter the cloud； and the aroused flash
Leaps onward； lumining with forky light
All places round。 And followeth anon
A clap so heavy that the skiey vaults；
As if asunder burst； seem from on high
To engulf the earth。 Then fearfully a quake
Pervades the lands； and 'long the lofty skies
Run the far rumblings。 For at such a time
Nigh the whole tempest quakes； shook through and through；
And roused are the roarings；… from which shock
Comes such resounding and abounding rain；
That all the murky ether seems to turn
Now into rain； and； as it tumbles down；
To summon the fields back to primeval floods：
So big the rains that be sent down on men
By burst of cloud and by the hurricane；
What time the thunder…clap； from burning bolt
That cracks the cloud； flies forth along。 At times
The force of wind； excited from without；
Smiteth into a cloud already hot
With a ripe thunderbolt。 And when that wind
Hath splintered that cloud； then down there cleaves forthwith
Yon fiery coil of flame which still we call；
Even with our fathers' word； a thunderbolt。
The same thing haps toward every other side
Whither that force hath swept。 It happens； too；
That sometimes force of wind； though hurtled forth
Without all fire； yet in its voyage through space
Igniteth； whilst it comes along； along；…
Losing some larger bodies which cannot
Pass； like the others； through the bulks of air；…
And； scraping together out of air itself
Some smaller bodies； carries them along；
And these； commingling； by their flight make fire：
Much in the manner as oft a leaden ball
Grows hot upon its aery course； the while
It loseth many bodies of stark cold
And taketh into itself along the air
New particles of fire。 It happens； too；
That force of blow itself arouses fire；
When force of wind； a…cold and hurtled forth
Without all fire； hath strook somewhere amain…
No marvel； because； when with terrific stroke
'Thas smitten； the elements of fiery…stuff
Can stream together from out the very wind
And； simultaneously； from out that thing
Which then and there receives the stroke： as flies
The fire when with the steel we hack the stone；
Nor yet； because the force of steel's a…cold；
Rush the less speedily together there
Under the stroke its seeds of radiance hot。
And therefore； thuswise must an object too
Be kindled by a thunderbolt； if haply
'Thas been adapt and suited to the flames。
Yet force of wind must not be rashly deemed
As altogether and entirely cold…
That force which is discharged from on high
With such stupendous power； but if 'tis not
Upon its course already kindled with fire；
It yet arriveth warmed and mixed with heat。
And； now； the speed and stroke of thunderbolt
Is so tremendous； and with glide so swift
Those thunderbolts rush on and down； because
Their roused force itself collects itself
First always in the clouds； and then prepares
For the huge effort of their going…forth；
Next； when the cloud no longer can retain
The increment of their fierce impetus；
Their force is pressed out； and therefore flies
With impetus so wondrous； like to shots
Hurled from the powerful Roman catapults。
Note； too； this force consists of elements
Both small and smooth； nor is there aught that can
With ease resist such nature。 For it darts
Between and enters through the pores of things；
And so it never falters in delay
Despite innumerable collisions； but
Flies shooting onward with a swift elan。
Next； since by nature always every weight
Bears downward； doubled is the swiftness then
And that elan is still more wild and dread；
When； verily； to weight are added blows；
So that more madly and more fiercely then
The thunderbolt shakes into shivers all
That blocks its path； following on its way。
Then； too； because it comes along； along
With one continuing elan； it must
Take on velocity anew； anew；
Which still increases as it goes； and ever
Augments the bolt's vast powers and to the blow
Gives larger vigour； for it forces all；
All of the thunder's seeds of fire； to sweep
In a straight line unto one place； as 'twere；…
Casting them one by other； as they roll；
Into that onward course。 Again； perchance；
In coming along； it pulls from out the air
Some certain bodies； which by their own blows
Enkindle its velocity。 And； lo；
It comes through objects leaving them unharmed；
It goes through many things and leaves them whole；
Because the liquid fire flieth along
Athrough their pores。 And much it does transfix；
When these primordial atoms of the bolt
Have fallen upon the atoms of these things
Precisely where the intertwined atoms
Are held together。 And； further； easily
Brass it unbinds and quickly fuseth gold；
Because its force is so minutely made
Of tiny parts and elements so smooth
That easily they wind their way within；
And； when once in； quickly unbind all knots
And loosen all the bonds of union there。
And most in autumn is shaken the house of heaven；
The house so studded with the glittering stars；
And the whole earth around… mo