"Tell me something else you must not do?" inquired the Colonel, assuming the rôle of regimental schoolmaster. "They hate pigs, sir," said Sandy Brown. "When I wis a stoker on a ship gaun East I flung a bit o' fried pork at a coolie. He nearly knocked ma lichts oot wi' a big hammer." "Yes, pigs are regarded by these fellows as unclean beasts. To offer them pork is, as Brown says, a great insult, so be careful of that. Another important point is his carpet. This is sacred. He kneels on that and offers up his prayers to Allah. When you walk into his house, don't wipe your feet and spit on it. Give him a chance to remove it. Can anyone tell me what those buildings in Cairo are with the big domes on them?" "Harems," piped Bill. "Chapels," said Doolan. "No, they are called mosques, or temples. Watch what you do there. Mohammedans always take off their shoes before entering. Inside is holy ground. If you go into them you must put a pair of shoes over your boots. These are kept for the purpose. Of course, don't walk away with the shoes, or there will be trouble. I have, also, a list here of other things regarded as sacred either in the town or country. "Trees with rags tied to them. "Tombs. "Graveyards. "Deserted mosques. "Stones with inscriptions on them. "Fountains, and "Isolated clumps of trees on hill tops. "Be careful, now, of all these things. They look nothing to you, but they are very important to them. You see, we are all Christians—or supposed to be—and a Christian is regarded by them as an infidel and son of a dog. "Next thing is the ladies. We all love the ladies. What do you know about them?" said the Colonel, suddenly pointing to a grinning youth.