Referenced By / The Rape of the Lock

• Isaac Asimov's Words of Science and the History Behind Them: The entry for "Umbra" explains the use of Umbrial as a name for a sad and gloomy spirit contrasting with William Shakespeare's Ariel from The Tempest. Umbrial first appeared in Alexander Pope's "The Rape of the Lock", and both Umbriel and Ariel are names given to Uranus's moons.

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