Mystrious psychic forces; an account of the author's invesigations in psychical research, together with those of other European savants
Camille Flammarion's 1907 Boston study of psychical research, published by Small, Maynard and company, recounts his investigations and those of other European scientists into spiritualist phenomena for a general readership. Its pictures are mostly plain line diagrams of apparatus and a grainy photograph of seated sitters around a small table, with hand-drawn devices and a table-levitation setup. A designer might take from them the spare, technical look of early twentieth-century scientific diagrams and the staged quality of period photographs.
