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What say of it? what say [of] CONSCIENCE grim,
That spectre in my path?
The picture used is Byam Shaw's illustration for this story for "Selected Tales of Mystery" (London : Sidgwick & Jackson, 1909) on the frontispiece with caption "A masquerade in the palazzo of the Neapolitan Duke Di Broglio"
To follow along: https://www.gutenberg.org/files/2148/2148-h/2148-h.htm#chap2.19