apparition of the monster
The undertone in which the text, as Walton reasserts his control over it,
questions the statements of its narrators continues here as Walton twice
-- and in the formulation of a logical proof ("conviction of the truth" .
. . "Such a monster has then really existence") -- thoughtlessly borrows
Victor's diction to describe the Creature. Careful readers will remember
that the "apparition . . . seen from our ship" was described very
differently at the time (Letter 4.1).