'The Centaur', Chapter 11, by Algernon Blackwood

"In scientific terms one can say: Consciousness is everywhere; it is awake when and wherever the bodily energy underlying the spiritual exceeds that degree of strength which we call the threshold. According to this, consciousness can be localized in time and space."

-Fechner, "Büchlein vom Leben nach dem Tode"

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Lipari Islands: Today this would be known as the Aeolian Islands, Lipari Island is the largest of the group. They form a volcanic archipelago in the Tyrrhenian Sea just north of Sicily.

scupper: a hole in a ship's side to carry water overboard from the deck

I'm outta deck pictures of the RMS Saxonia, so we get a pic of the island of Lipari instead as that is where they were passing by this chapter.