THE PASSAGE OF LAKE CHAD 99 



inhabited islands of good elevations and well clothed with 

 maio bush, which the Budumas call " Korbai." 



At length after going for a distance of ten miles we reached 

 the Kanem coast at a place called Wunnda. The shore Hne 



BLDUMA HUTS ON KAKRA-RAGGA 



at this point is very much fretted, and Wunnda itself during a 

 rise of water must be cut off from the mainland, for marshy- 

 channels lie behind it. Here I saw a large amount of potash 

 which had come a five days' journey from the interior of 

 Kanem. The potash is made in flat, cone-shaped blocks 

 weighing 30 lb. each, eight of which are sold in Bornu for 

 a dollar. Kanem appeared to be a most desolate country 

 of nothing but sand-dunes covered with scrubby mimosa, 

 the branches of which were whitened by the wind-swept 

 sand. 



On May 19 the Kachella and his men said good-bye to 

 us and we went southwards to Bui, a small French station 



