IN all countries and all ages, people have resorted to amulets and mascots to bring them luck or ward off evil chance, and the savage's necklace of human teeth is the direct ancestor of the horseshoe ovor the door and the swastika in a modern woman's brooch. Mrs. Grant has travelled much in the wilds of North Africa, and learned a good deal about the customs of its little-known inhabitants, but her talk today will cover many other parts of the world.