Symbolist Art, Edward Lucie-Smith (Oxford University Press, 1972)
This is the kind of information that seems to be left out of recent art history books. Instead, we get long analyses of the major figures and their works from a post-structuralist point of view, and etc., boring -isms. This is what we need to know: Huysmans and Péladan were engaged in an occult battle. If this doesn’t explain everything to you, then you need to go back to reading about political science because there’s no hope for you.