Far down in the Desert of Sahara is the little oasis of El Merb. It isso small that our crude atlases miss it. It has but one well, and thefertile land is not more than forty rods in diameter. It has a mosque,a bazaar, a slave-market, and a café. It is called by the traders ofBiskra "The Key of the Desert." It is called by the Mohammedan priestsof Biskra "The Treasury of the Desert." It is called by the Frenchcommandant at Biskra "A place to be watched." The only communicationbetween El Merb and Biskra is by camels, and Abdullah was once thechief caravan-master.