And then there's this:

On the Creation of Niggers  (1912)

by H. P. Lovecraft

When, long ago, the gods created Earth

In Jove’s fair image Man was shaped at birth.

The beasts for lesser parts were next designed;

Yet were they too remote from humankind.

To fill the gap, and join the rest to Man,

Th’Olympian host conceiv’d a clever plan.

A beast they wrought, in semi-human figure,

Filled it with vice, and called the thing a Nigger.

Via Nnedi Okorafor's blog.