These migrations occur in spring or, more frequently, in autumn--but only when the weather is exactly right. Spiders may sit patiently for days, waiting for a calm, clear, windless day. On such days the steady upward currents of air from the sun-warmed ground carry the spiders gently aloft[XI-7]. The association of angel hair with UFO sightings is completely natural. The drifting patches of gossamer reflect the sun brilliantly. A whole armada of saucers can appear overhead and then vanish as the gossamer cascades to earth. The description of the material and the date of the fall both indicate that the angel hair observed in France in October 1952 was of arachnid origin. Even the weather was exactly right--“superb, with a sky of cloudless blue”--for the migration of a smother of spiders. A similar fall of angel hair occurred in the United States on October 22, 1954, near a school in Marysville, Ohio. At afternoon recess the pupils of the Jerome Elementary School noticed a dazzlingly bright object in the sky. It disappeared, and for the next forty-five minutes both children and teachers watched white, cottonlike tufts floating slowly down to the ground. The material was in long strands, very fine and soft, could be stretched and rolled into a tiny ball, but quickly vanished to nothing and left a green stain on the hands. The stuff clung to grass and cars, draped the telephone wires for a distance of three miles, and was like a misty canopy over the road[XI-6]. Unfortunately none of the material was preserved and no analysis was possible. Marysville is near Columbus, Ohio, an industrial center, and the stuff might have been waste products from one of the many factories. Since similar falls were reported in Indiana during the same period, the substance more probably was gossamer. As in the French incidents, the time was late October and the weather was perfect, a warm autumn day with a sunny, cloudless sky. Both the time and the weather were ideal for migrating spiders to take to the air, float down to earth on their fluffy parachutes, and then discard the no longer necessary _fils de la Vierge_. Many falls of angel hair that occur in the warm days of Indian summer are probably abandoned gossamer. It is significant that of fourteen such incidents reported in Europe and the United States, all but three took place in October and November, the season of spider migration[XI-6]. In one of the three incidents reported in other months (Horseheads, New York, February 21, 1955) the angel hair was identified as waste products from the local milk plant.