The aggressiveness—in the forms of racial and ethnic prejudice, imperial braggadocio, and unvarnished Eurocentrism—are all discursive in the travelogue.
Instead of changing outside occurrences to solve what we recognize as 'problems, ' we could also free ourselves from these problems by letting the discursive activities in our minds dissolve.
So what follows the " that is" is a series of words and phrases that are themselves in need of an explanation no discursive elaboration could possibly provide.
He was suggestive about murderers, illuminating on murder, discursive about human nature, and libelously rude about the police and their methods, all with a pleased eye on the helpless Grant.
Apart from this, given the fact that such books are often more poetical than discursive or philosophical, and that they are special kinds of history, there is perhaps little more to add.