I think Fitzgerald intends to establish a parallel between Mighty Yawn and Great Breath, being satirical about the creative activity described in Genesis where the breath of God gives birth to man.
My interpretation of the last paragraph: The lecture hour is up and the students file out as soon as they can (before the last word or two is spoken, "cheating" the lecturer of that last bit of time). As they exit noisily, the lecturer (and by extension, the lecture itself) is so absent from their minds it's as if they've forgotten the lecturer even existed.
manpreet
Best Answer
2 years ago
I have been reading This Side of Paradise and came across an ambiguous phrase that ends Amory Blaine's little satire in which he mocks his professors. I have reproduced the satire along with an additional passage before that might help clarify sentiments expressed in the satire and perhaps the meaning of the end line: "The Mighty Yawn that gave you birth".