In this novel the character is known as "de Selby", with the latter capital D appearing in use in O'Brien's The Dalkey Archive.
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De Selby also appears in O'Brien's The Dalkey Archive, in which he develops a substance ("D.M.P.") capable of extracting all oxygen from an airtight enclosure, of disrupting the sequentiality of time, and of producing fine mature whiskey in a week.
The book features a mad scientist, De Selby, who tries to destroy the world by removing all the oxygen from the air.
Selby | Osgodby, Selby | Selby to Driffield Line | Selby railway station | Selby (district) | David Selby | Thomas Henry Selby | Selby Avenue | Prideaux John Selby | Marie Selby Botanical Gardens | Joseph D. Selby | William Selby Lowndes | Thomas Selby Egan | Thomas J. Selby | Stapleton, Selby | Selby family | Robert of Selby | Mark Selby | Kathryn Selby | Henry Selby Hele-Shaw | Harry Selby | Erin Selby | Edward Selby Smyth | De Selby | Bertram Luard-Selby |
Saint Augustine, on the other hand, appeared in a magical underwater cave and held a conversation with De Selby.