I still won't buy these apparitions are trips to the past.
This is a curious book, partly explanatory of Defoe's ideas on morality, and partly belonging to a series of demonological works which he wrote, and of which the chief others are A System of Magic (1726), and An Essay on the History of Apparitions (1728), issued the year before under another title.
Among these phenomena are: trance and unconsciousness, sickness, death, clairvoyance, dreams, apparitions of the dead, wraiths, hallucinations, echoes, shadows and reflections.
Associated with Pan is a number of Panisci, male and female forest imps, his wives and children, who send evil dreams and apparitions to terrify mankind.
Such words and apparitions mean, and what indications they afford to this man or that, of past, present or future good and evil.