Sentence:  But it is not all of the curse of <WSD>Babeldom</WSD> in the passage — unless we are to suppose that, in the two sentences following that on which I have been commenting, we have only a statement of the truism that the appearance of the country and our customs have improved with civilization, -- which would be irrelevant to the though preceding. 
Meaning of the word marked with <WSD> tags:  A confused mix of voices, languages, or words and ideas.