…their action; the tiger and crocodile were too easily satiated and not cruel enough: something more constantly, more ruthlessly, more ingeniously destructive was needed; and that something was Man, the inventor of the rack, the stake, the gallows, and the electrocutor; of the sword and gun; above all, of justice, duty, patriotism and all the other isms by which even those who are clever enough to be humanely disposed are persuaded to become the most destructive of all the destroyers.
There are no more uses of "humane" in the book.
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The Humane Society is working to eliminate cruelty to animals.
The chickens are not treated humanely. Their living conditions are inhumane.