Hippolyte BARADUC, Charles Vernon BOYS (1855-1944), Sir Arthur Conan DOYLE, DUCASSE-HARISPE, FINOT, FONTENAY, GUEBHARD, Charles MENDEL, Albert de ROCHAS

CONSTRAINT : to ϕ the Od (the “vital force” of the universe).

INVENTION : spirit ϕ (and fairy ϕ in the case of Doyle).

WORKS : reproduced in their books on the subject. Boys complicated the constraint by restricting his choice of medium to his secret mistress.