This scan is hard to make out, but there are three enormous blue shrouded spirits hovering behind the columns.  From The Judge, 1922.

How one sees a ghost.  From Modern Psychical Phenomena: Recent Researches and Speculations by Hereward Carrington, 1919.

Boxing a ghost.  From Le Rire, 1919.

There's even a ghostly title page in The Spiritual Pilgrim, A Biography of James M. Peebles by Joseph Osgood Barrett, 1878.

From "Ghost Gossips at Bogle Hall," in The Royal Lady's Magazine, 1831.

Revealed -- the cause of migraines.  From Lustige Blätter, 1902.

By Otto Schön.  From Der Orchideengarten, 1919.

Accessorizing with a dog, while a ghost looms in the background.  From Lustige Blätter, 1902.

"She saw instead of her own face in the glass, the face of her dead Aunt Harriet!"  From The Wind in the Rose-bush and Other Stories of the Supernatural by Mary Eleanor Wilkins Freeman, 1903.

Here's a precursor to wonky-eyed Cardinal Copia from the superb band Ghost.  From Lustige Blätter, 1902.  (The portrait of Cardinal Copia in our collage is by maxime_draw69.)

Previously, we delved into the hidden meanings begind Ghost's cover of the song "If You Have Ghosts, You Have Everything."

From Jugend, 1906.