I accordingly set out for Tottous, an important water point 70 miles further west, in the Wadi Domar where it comes out of the last foothills of the Tibesti. The distance was covered in four days with little trouble by following the lower valley of the Wad Miski, of which I was thus enabled to cross in succession all the tributaries on the right bank, till then unknown. The officer in command of the Zouar camel corps, having been informed after my visit to Bardai that I was desirous of seeing him, came to meet me, and we reached Tottous on the same day. He was accompanied by the chief of the Tomagras, the noblest tribe among the Têda-tous, the aged Guetty, who had made his submission to the French authorities a few months earlier. Guetty was a handsome old man with a white beard and a skin less dark than usual. He was tall and regular featured, but his keen sly face inspired me with no great confidence; he was suspected of double-dealing, and of supplying the rebels with fuller information about our movements than us about theirs. During two days we had long conversations about the restitution to their families of the women and children that his fellow-tribesmen had carried off in 1913 in the course of a razzia on an Arab tribe of Kanem; but the old rascal either could not or would not fall in with my wishes, declaring truly or falsely that the luckless captives had been sold as slaves and sent away for the most part to the Senoussists of Cyrenaica. _The Return Journey to Borkou._—The exhaustion of my camels had reached such a point that I had to stay five days in the grazing-grounds of Tottous. I profited by the delay to explore the course of the Wadi Domar for about a score of miles in company of the Zouar camel corps, who were going back to their station. My food supplies, which had not been renewed for two months, were coming to an end, and I could not further prolong my excursions in the valleys of Tibesti. Besides, the greater part of the rebels had concentrated in the region of Abo, at the north- western end of the massif, twelve whole days’ march away from Tottous. Starting on November 4 for Faya, by a route hitherto unreconnoitred, we covered 120 miles of desert in six days before reaching the oasis of Kirdimi, near Ain Galakka, by the last and utmost effort our camels were capable of. On November 12 at nightfall I found myself back in my post of Faya, whose stout clay huts seemed to me for a whole week afterwards, if not absolutely the last word, at least the last word but one of comfort and civilization in the heart of the Sahara. =8. Military Operations in 1916-1917.=