
Max M. answered 04/04/19
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Hi again--
So first, yes, you have the right definition of humours. More specifically, humours are bodily fluids, which were believed to be associated with emotions. To oversimplify, blood=friendliness or enthusiasm, yellow bile = anger, black bile = depression, and phlegm = apathy or boredom. The theory was that good health meant keeping them in balance, and that too much of one was bad for you, and showed up in strange or antisocial behavior. We still use a lot of the vocabulary around this theory even though medicine has advanced quite a bit since then. For example, melancholy comes from the Greek words for black bile.
So it looks as though Zelazny is saying that while most PKD stories can't be described with a single adjective, such as "whimsical" in this case (since like a healthy Elizabethan, their humours are well-balanced), this one book is easier to categorize.