If, in addition to the circumstances already described, the atmosphere be highly impregnated with vapor and dense exhalations, not previously dispersed by the action of the wind and waves, or rarified by the sun, it then happens that, in this vapor, as in a curtain extended along the channel to the height of above forty palms, and nearly down to the sea, the observer will behold the scene of the same objects not only reflected on the surface of the sea, but likewise in the air, though not so distinctly or well-defined. Lastly, if the air be slightly hazy and opaque, and at the same time dewy, and adapted to form the iris, then the above-mentioned objects will appear only at the surface of the sea, as in the first case, but all vividly colored or fringed with red, green, blue, or other prismatic colors.” Aerial images of terrestrial objects are frequently produced as the simple effect of reflection. Dr. Buchan mentions the following occurrence:—“Walking on the cliff about a mile to the east of Brighton, on the morning of the 18th of November, 1804, while watching the rising of the sun, I turned my eyes directly to the sea, just as the solar disc emerged from the surface of the water, and saw the face of the cliff on which I was standing represented precisely opposite to me, at some distance from the ocean. Calling the attention of my companion to this appearance, we soon also discovered our own figures standing on the summit of the opposite apparent cliff, as well as the representation of a windmill near at hand. The reflected images were most distinct precisely opposite to where we stood; and the false cliff seemed to fade away, and to draw near to the real one, in proportion as it receded toward the west. This phenomenon lasted about ten minutes, till the sun had risen nearly his own diameter above the sea. The whole then seemed to be elevated into the air, and successively disappeared. The surface of the sea was covered with a dense fog of many yards in height, and which gradually receded before the rays of the sun.” In December, 1826, a similar circumstance excited some consternation among the parishioners of Miqué, in the neighborhood of Poitiers, in France. They were engaged in the exercises of the jubilee which preceded the festival of Christmas, and about three thousand persons from the surrounding parishes were assembled. At five o’clock in the evening, when one of the clergy was addressing the multitude, and reminding them of the cross which appeared in the sky to Constantine and his army, suddenly a similar cross appeared in the heavens, just before the porch of the church, about two hundred feet above the horizon, and a hundred and forty feet in length, of a bright silver color tinged with red, and perfectly well-defined. Such was the effect of this vision, that the people immediately threw themselves upon their knees, and united together in one of their canticles. The fact was, that a large wooden