Sentence:  And, is there less Probability in my Account of the "Houyhnhnms" or "Yahoos", when it is manifest as to the latter, there are so many Thousands even in this City, who only differ from their Brother Brutes in "Houyhnhnmland", because they use a Sort of a <WSD>"Jabber</WSD>", and do not go naked. 
Meaning of the word marked with <WSD> tags:  Rapid or incoherent talk, with indistinct utterance; gibberish.