She crossed her trousered legs, and snuggled luxuriously above her saucer of ginger; she caught Pollock’s congratulatory still smile, and thought well of herself for having thrown a rose light on the pallid lawyer; repented the heretical supposition that any male save her husband existed; jumped up to find Kennicott and whisper, "Happy, my lord?
There are no more uses of "supposition" in the book.
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It is a foolish supposition.
She paints a vivid picture, but we must remember it is all mere supposition.