Hello NL888, No, This is an a fortiori argument. THH is saying that the fact that the negro is not the equal of the white man means a fortiori that he is not superior to the white man. He is making clear that by not equal to he means not equal to or greater than .
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NL888 Thanks. My dictionary tells a fortiori is pronounced as /'ei,f?:ti'?:rai/. is it acceptable?Yes. That's certainly how I've always heard it pronounced in British English.