[Felicia Mary Frances Skene]. Hidden Depths (Two Volumes in One). Edinburgh: Edmonston and Douglas, 1866. First edition. Octavo. 223pp. Half-calf over marbled boards (rebacked), gilt-stamped title to spine, five raised bands, marbled edges and endleaves. Personal observations of the lives of prostitutes in Oxford slums, disguised in novel form in which the heroine.....