Again, from following cause it comes to pass That yon swift golden hue of liquid fire Darts downward to the earth: because the clouds Themselves must hold abundant seeds of fire; For, when they be without all moisture, then They be for most part of a flamy hue And a resplendent. And, indeed, they must Even from the light of sun unto themselves Take multitudinous seeds, and so perforce Redden and pour their bright fires all abroad. And therefore, when the wind hath driven and thrust, Hath forced and squeezed into one spot these clouds, They pour abroad the seeds of fire pressed out, Which make to flash these colours of the flame. Likewise, it lightens also when the clouds Grow rare and thin along the sky; for, when The wind with gentle touch unravels them And breaketh asunder as they move, those seeds Which make the lightnings must by nature fall; At such an hour the horizon lightens round Without the hideous terror of dread noise And skiey uproar. To proceed apace, What sort of nature thunderbolts possess Is by their strokes made manifest and by The brand-marks of their searing heat on things, And by the scorched scars exhaling round The heavy fumes of sulphur. For all these Are marks, O not of wind or rain, but fire. Again, they often enkindle even the roofs Of houses and inside the very rooms With swift flame hold a fierce dominion. Know thou that nature fashioned this fire Subtler than fires all other, with minute And dartling bodies,--a fire 'gainst which there's naught Can in the least hold out: the thunderbolt, The mighty, passes through the hedging walls Of houses, like to voices or a shout,-- Through stones, through bronze it passes, and it melts Upon the instant bronze and gold; and makes, Likewise, the wines sudden to vanish forth, The wine-jars intact,--because, ye see, Its heat arriving renders loose and porous Readily all the wine--jar's earthen sides, And winding its way within, it scattereth The elements primordial of the wine With speedy dissolution--process which Even in an age the fiery steam of sun Could not accomplish, however puissant he With his hot coruscations: so much more Agile and overpowering is this force. ***** Now in what manner engendered are these things, How fashioned of such impetuous strength As to cleave towers asunder, and houses all To overtopple, and to wrench apart Timbers and beams, and heroes' monuments To pile in ruins and upheave amain, And to take breath forever out of men, And to o'erthrow the cattle everywhere,-- Yes, by what force the lightnings do all this, All this and more, I will unfold to thee, Nor longer keep thee in mere promises.