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- "I understand you well," said my master: "it is now very plain, from all you have spoken, that whatever share of reason the Yahoos pretend to, the Houyhnhnms are your masters; I heartily wish our Yahoos would be so tractable."Part 4 -- A Voyage to the Country of the Houyhnms (25% in)
- ...brutes, as industry is taught by the ant, and building by the swallow (for so I translate the word lyhannh, although it be a much larger fowl); that this invention might be practised upon the younger Yahoos here, which besides rendering them tractable and fitter for use, would in an age put an end to the whole species, without destroying life; that in the mean time the Houyhnhnms should be exhorted to cultivate the breed of asses, which, as they are in all respects more valuable...Part 4 -- A Voyage to the Country of the Houyhnms (68% in)
There are no more uses of "intractable" in Gulliver's Travels.
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