_Ignis Fatuus._ This wandering meteor known to the vulgar as the Will-o’-the-Wisp, has given rise to considerable speculation and controversy. Burying-grounds, fields of battle, low meadows, valleys, and marshes, are its ordinary haunts. By some eminent naturalists, particularly Willoughby and Ray, it has been maintained to be only the shining of a great number of the male glow-worms in England, and the pyraustæ in Italy, flying together—an opinion to which Mr. Kirby, the entomologist, inclines. The luminosities observed in several cases may have been due to this cause, but the true meteor of the marshes cannot thus be explained. The following instance is abridged from the Entomological Magazine:—“Two travelers proceeding across the moors between Hexham and Alston, were startled, about ten o’clock at night, by the sudden appearance of a light close to the road-side, about the size of the hand, and of a well-defined oval form. The place was very wet, and the peat-moss had been dug out, leaving what are locally termed ‘peat-pots,’ which soon fill with water, nourishing a number of confervæ, and the various species of sphagnum, which are converted into peat. During the process of decomposition these places give out large quantities of gas. The light was about three feet from the ground, hovering over the peat-pots, and it moved nearly parallel with the road for about fifty yards, when it vanished, probably from the failure of the gas. The manner in which it disappeared was similar to that of a candle being blown out.” We have the best account of it from Mr. Blesson, who examined it abroad with great care and diligence. [Illustration: Ignis Fatuus.]