The Virgin appeared to Ignatius Loyola, and confirming his designs, urged him to the enterprise he had in view for the establishment of the Roman Catholic church on a surer basis. Satan came visibly to Luther and contended with him, sometimes worsting him in argument. Swedenborg beheld in visions the heavenly scenes which his imagination had pourtrayed; while Pascal wrote he beheld an abyss of flames beside his writing-table; and Symeon Stylites conceived that Satan had appeared to him under the form of Jesus Christ, and invited him to ascend to heaven in a chariot drawn by cherubim. Symeon put out his foot to enter the chariot, when the whole vanished; and, as a punishment for his presumption, the offending thigh was affected with an ulcer, which obliged him to rest upon one leg for the remainder of his life.

It is important to comprehend fully the influence of the imagination in developing visions of this nature, particularly in a disordered state of the health, from the important effects which they have exercised and still exercise upon mankind.

The following example is an interesting illustration of the nature and source of these hallucinations:

Some years ago considerable attention was excited in Germany by the publication of a series of visions which a lady of considerable literary attainments and high character had beheld, and for which she believed that she was indebted to divine favour.

The hallucinations which she experienced had first been noted in the fourth year of her age, when one day, as she was dressing a doll, and for greater convenience had placed a large folio Bible beneath her feet, she heard a voice exclaim: "Put the book where you found it!" She did not immediately obey the order, as she saw no one, but in a few moments the mandate was repeated, and she thought some one took hold of her face. This hallucination, according to Dr. Hibbert, is to be regarded as a renovated feeling arising from some prior remonstrances regarding the holy volume; and, we would add, together with the altered sensation experienced in the face, was evidently due to the earlier stages of a disease which occasioned the more fully developed visions. After this period, she devoted herself to the study of the Scriptures; and her labours, in this respect, were incessant and protracted. In her seventh year she saw, when playing, a vision of a clear flame which entered the chamber door, in the centre of which was a strong bright light, described as about the size of a child six years old. This vision endured about half an hour. No other vision is mentioned until the period of her marriage, which proved unfortunate, embittering her life and causing her constantly to meditate on death. It was in this state of mind that the principal visions to which she was subjected occurred. On one occasion, after receiving some ill-treatment from her husband, broken down in spirits, and thinking the Lord had forsaken her, she made a resolution to desist from prayer. On retiring to bed, she repented the decision she had made, and prayed fervently. She awoke in the morning before daybreak, and was surprised to find the room vividly illuminated, and that at the bedside was seated a heavenly figure, in the form of an old man. This phantom was dressed in a blueish robe, and had bright hair; and the countenance shone like the clearest red and white crystal. It regarded her benignantly, and said, "Proceed, proceed, proceed!" At first the words were unintelligible to her, but a young and beautiful angel, which appeared on the other side of the bed, exclaimed: "Proceed in prayer, proceed in faith, proceed in trials!" After this the devil appeared, pulled her by the hair, and tormented her in other ways, until the angel interfered, and drove him away. Satan in this case assumed his usual hideous garb. Subsequently one of the angels exclaimed, three times: "Lord, this is sufficient;" and while saying these words, the lady beheld large wings on his shoulders, and knew him to be an angel of God. The light and the angels then vanished, and the lady felt eased of her grief, and arose.

If the nature of the figures and the mode of action in these visions had not sufficed to show how completely they were dependent upon dominant ideas and a disordered state of the nervous system, the history of the case would demonstrate it. The early, protracted, and inordinate study of religious beliefs, similar to that which laid the basis of Swedenborg's visions; the painful state of the mind induced by her unhappy marriage, and disease, were the source of the hallucinations to which she was subject; for it was ascertained that when the visions occurred she always suffered from slight attacks of epilepsy.

Intense and protracted mental exertion frequently gives rise to hallucinations.

A medical gentleman in Edinburgh, while seated one evening in his library, after a period of excessive study, on raising his head, was startled by perceiving at the opposite side of the table the spectre of a gentleman who had died under melancholy circumstances some days previously, and at whose post-mortem examination he had assisted.

That excessive action of the imagination, and consequent absorption of the mind in its own workings, to exclusion of external sensations, which is common in men of genius, has been a fertile source of hallucinations.

In some instances the hallucinations have been "counterfeit presentments" of the ideas which have been most prominent in the mind; in others they have had no relation to that condition.