vision of the eye seems thus to have been under the influence of his will, but his hearing was beyond his control. A very interesting class of visions accompanied by undoubted magic phenomena, and as frequent in our day as at any previous period, is formed by those which are the result of climatic and topographic peculiarities. We have already stated that the peculiar impression made upon predisposed minds by vast deserts and boundless wastes is frequently ascribed, by the superstitious dwellers near such localities, to the influence of evil spirits. Such a vision is the Ragl of Northern Africa, which occurs either after fatiguing journeys through the dry, hot desert, in consequence of great nervous excitement, or as one of the symptoms of typhoid fever in native patients. Seeing and hearing are alike affected, the other senses only in rare cases. Ordinarily the eye sees everything immensely magnified or oddly changed; pebbles become huge blocks of stone, faint tracks in the hot sand change into broad causeways or ample meadows, and distant shadows appear as animals, wells, or mountain-dells. If the moon rises the vision increases in size and distinctness; the scene becomes animated, men pass by, camels follow each other in long lines, and troops are marching past in battalions. Then the ear also begins to succumb to the charm; the rustling of dry leaves becomes the sweet song of numerous birds; the wind changes into cries of despair, and the noise of falling sand into distant thunder. The brain remains apparently unaffected, for travelers suffering of the Ragl are able to make notes and record the symptoms, although the note-book looks to them like a huge album with costly engravings. There can be little doubt that the great afflux of blood to the eyes and the ears is the first cause of these phenomena, but the peculiar nature of the visions remains still a mystery. One striking peculiarity is their unvarying identity in men of the same race and culture; Europeans have their own hallucinations which are not shared by Africans; the former see churches, houses, and carriages, the latter mosques, tents, and camels, thus proving here also the fact that these delusions of the senses are produced in the mind and not in the outer world. Travelers who suffer from hunger or from the dread effects of the simoon are naturally more subject to the Ragl than others; the visions generally appear towards midnight and continue till six or seven o'clock in the morning, while during the day they are only seen in cases of aggravated suffering. Another peculiarity is the fact that these visions connect themselves only with small objects and moderate sounds; the gentle friction of a vibrating tassel on his camel's neck appeared to the great explorer Richardson like the clacking of a mill-wheel, but the words shouted by his companion sounded quite natural. Thus he saw in every little lichen a green garden spot, but the stars he discerned distinctly