I have been rather prolix on this subject, because I do not remember to have seen any correct account of it in any writer, although the circumstance of seeing spectres during the paroxysm of Incubus is noticed by the most ancient medical writers and others, both Greek and Roman; many of whom attributed the whole phenomenon of _Ephialtes_, or _Incubus_, to the agency of Dæmons. This affection has likewise been noticed by St. Augustine as well as other Fathers of the Church, who considered it to be the work of Dæmons, and speaks of it as a thing common in those days.--ST. AUGUSTIN. _De Civitate Dei_, lib. 15. c. 23.--“_Dæmones, scilicet, qui mulieribus se commiscent, et ab incubando_ INCUBI _dicuntur, sicuti, qui viris, et patiuntur muliebria_, SUCCUBI.” “_Sunt nonnulli, qui hoc malum Incubi nomen accepisse putant, ex eo, quod Ephialte laborantes, opinantur, hominem qui illos opprimit, turpis libidinis usum ab iis exigere, seu una cum illis concumbere._”--SENNERTUS, Tom. ii. Liber i. part. 2. Cap. xxix. _de Incubo_. _Vide quæ supra de Priapismo memoravimus; necnon de Cordis palpitatione quæ revera Priapismi etiam somnorumque supradictorum causa mihi esse videtur; impulsum est nimirum in arterias pudicas plus sanguinis quam per venas revehi potest, unde partes genitales vellicantur et stimulantur, somniisque venereis, non tamen sine horrore quodam, ansa præbetur._ There is a symptom, said by Etmuller, and some others of the ancient medical writers, to occur frequently in this disease, but which I have never met with; that is, the appearance of red, or livid, or purple spots upon the limbs and body, but especially on the thighs.--These are said to remain till morning, and then disappear. The following case is related by that celebrated Physician: