Contents: spiritualism and materialism, a reply to Camille Saint-Saens; experimental proofs of survival; haunted houses, a first survey of the subject; strange phenomena in a Calvados castle; haunted house of La Constantinie (Correze); hauntings, ancient and modern; mysterious noises at parsonage, the teacher's house, an indivisible companion; fantastic Villa of Comeada, Coimbra (Portugal); Cherbourg observations, what is the aura of a dwelling; a general excursion among haunted houses; classification of phenomena, hauntings associated with the dead; haunting phenomena not attributable to the dead, raping spirits, poltergeist; spurious haunted houses; search of causes; unknown of yesterday is the truth of tomorrow.