I believe it would be ghosts, and the dead. According to some resources, he had contact with the dead and it frightened him
Hope this helps!!
struggles for power between the president and the Congress-
Congress passed the Tenure of Office Act in order to limit
the President's powers and prevent President Andrew Johnson from discharging
radical Republicans from office. This resulted from a conflict between
President Andrew Johnson and the radical Republicans over the Reconstruction of
the South
National Harbors aided industrialization in Great Britian