In such spots, the passage in Exodus has frequently occurred to me as bearing reference to these vermin, which are the greatest enemies to man and beast. It is well known that, from the size of a grain of sand in their natural state, they will distend to the size of a hazelnut after having preyed for some days upon the blood of an animal. The Arabs are invariably infested with lice, not only in their hair, but upon their bodies and clothes; even the small charms or spells worn upon the arm in neatly-sewn leathern packets are full of these vermin. Such spells are generally verses copied from the Koran by the Faky, or priest, who receives some small gratuity in exchange. The men wear several such talismans upon the arm above the elbow, but the women wear a large bunch of charms, as a sort of chatelaine, suspended beneath their clothes around the waist.