From The Princess and Curdie by George MacDonald and illustrated by Charles Folkard, 1949.

From The Strand, 1894.

She was terribly frightened when she saw the face of the dead staring at her from behind the window.  From Les Extraterrestres, 1970.

It's an enduring rhetorical question.  Materialized Apparitions: If Not Beings From Another Life, What Are They by Edward Augustus Brackett, 1908.

"The apparitions at the castle of Blandy."  From The Mystery and Lore of Apparitions by C. J. S. Thompson, 1930.

"An unexpected apparition."  From Twice a Week, 1862.

From Lustige Blätter, 1917.

From The Apparition by Arthur Montagu Brookfield, 1884.

"A tall, graceful figure, dressed in flowing silver draperies."  From Pall Mall, 1895.

"An apparition formed in full view."  From 'Twixt Two Worlds by John Stephen Farmer, 1886.

From Der Orchideengarten, 1919.

From Paul Ardenheim, the Monk of Wissahikon by George Lippard, 1848.

"She was a phantom of delight, / When first she gleamed upon their sight; / A lovely apparition, sent / To be the Gnome-men's ornament."  From The Sketch, 1906.

"What is the truth about ghosts?"  From Popular Mechanics, 1927.

Dissertations Upon the Apparitions of Angels, Daemons, and Ghosts - And Concerning the Vampires of Hungary, Bohemia, Moravia, and Silesia by Augustin Calmet, 1759.