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LXXXVI.

Zóphiël looked up to know; and, to his view,
Scarce seemed less vast than day's the vault that bent
In lofty arch, its soft, receding blue
As of the sky, with tender cloudlets sprent;

It was perfectly in the power of optics and chemistry; of which sciences these beings were in possession, to produce the effect described beneath the roof of so vast a cavern.