The sheikh's English was a vanishing quantity, but to judge by the way he nodded and salaamed at this playful remark, I am convinced he understood the Doctor's Irish quite as well as I did.

We spoke little by the way; we were all far too frightened, except the Doctor, who kept our hearts up by a running fire of wild Celtic humour. But I found time meanwhile to learn by a few questions from our veiled friend something of her captivity. She had seen her father massacred before her eyes at Khartoum, and had then been sold away to a merchant, who conveyed her by degrees and by various exchanges across the desert through lonely spots to the Senoosi oasis. There she had lived all those years with the chief to whom her last purchaser had trafficked her. She did not even know that her husband's village was an integral part of the Khedive's territory; far less that the English were now in practical occupation of Egypt. She had heard nothing and learnt nothing since that fateful day; she had waited in vain for the off-chance of a deliverer.

'But did you never try to run away to the Nile?' I cried, astonished.

'Run away? How could I? I did not even know which way the river lay; and was it possible for me to cross the desert on foot, or find the chance of a camel? The Senoosis would have killed me. Even with you to help me, see what dangers surround me; alone, I should have perished, like Hagar in the wilderness, with no angel to save me.'

'An' ye've got the angel now,' Dr. Macloghlen exclaimed, glancing at me. 'Steady, there, Mr. Sheikh. What's this that's coming?'

It was another caravan, going the opposite way, on its road to the oasis! A voice halloaed from it.

Our new friend clung tight to me. 'My husband!' she whispered, gasping.

They were still far off on the desert, and the moon shone bright. A few hurried words to the Doctor, and with a wild resolve we faced the emergency. He made the camels halt, and all of us, springing off, crouched down behind their shadows in such a way that the coming caravan must pass on the far side of us. At the same moment the Doctor turned resolutely to the sheikh. 'Look here, Mr. Arab,' he said in a quiet voice, with one more appeal to the simple Volapuk of the pointed revolver; 'I cover ye wid this. Let these frinds of yours go by. If there's anny unnecessary talking betwixt ye, or anny throuble of anny kind, remimber, the first bullet goes sthraight as an arrow t'rough that haythen head of yours!'

The sheikh salaamed more submissively than ever.

The caravan drew abreast of us. We could hear them cry aloud on either side the customary salutes: 'In Allah's name, peace!' answered by 'Allah is great; there is no god but Allah.'