Pliny[275] the younger had a freed-man named Marcus, a man of letters, who slept in the same bed with his brother, who was younger than himself. It seemed to him that he saw a person sitting on the same bed, who was cutting off his hair from the crown of his head. When he awoke, he found his head shorn of hair, and his hair thrown on the ground in the middle of the chamber. A little time after, the same thing happened to a youth who slept with several others at a school. This one saw two men dressed in white come in at the window, who cut off his hair as he slept, and then went out by the same window: on awaking, he found his hair scattered about on the floor. To what can these things be attributed, if not to an elf? Plotinus,[276] a Platonic philosopher, had, it is said, a familiar demon, who obeyed him from the moment he called him, and was superior in his nature to the common genii; he was of the order of gods, and Plotinus paid continual attention to this divine guardian. This it was which led him to undertake a work on the demon which belongs to each of us in particular. He endeavors to explain the difference between the genii which watch over men. Trithemius, in his Chronicon Hirsauginse,[277] under the year 1130, relates that in the diocese of Hildesheim, in Saxony, they saw for some time a spirit which they called in German _heidekind_, as if they would say _rural genius_, _heide_ signifying vast country, _kind_, child (or boy). He appeared sometimes in one form, sometimes in another; and sometimes, without appearing at all, he did several things by which he proved both his presence and his power. He chose sometimes to give very important advice to those in power; and often he has been seen in the bishop's kitchen, helping the cooks and doing sundry jobs. A young scullion, who had grown familiar with him, having offered him some insults, he warned the head cook of it, who made light of it, or thought nothing about it; but the spirit avenged himself cruelly. This youth having fallen asleep in the kitchen, the spirit stifled him, tore him to pieces, and roasted him. He carried his fury still further against the officers of the kitchen, and the other officers of the prince. The thing went on to such a point that they were obliged to proceed against him by (ecclesiastical) censures, and to constrain him by exorcisms to go out of the country. I think I may put amongst the number of elves the spirits which are seen, they say, in mines and mountain caves. They appear clad like the miners, run here and there, appear in haste as if to work and seek the veins of mineral ore, lay it in heaps, draw it out, turning the wheel of the crane; they seem to be very busy helping the workmen, and at the same time they do nothing at all.