281 
CHAP. LXI. 
PROVINCE OP LIBTAKO. SOUTH-EASTERN LIMIT OP THE RANGE 
OF THE COMMERCE OP TIMBUKTU. 
We left Sebba the capital of the wilderness — Saturday, 
birni-n-daji, as I called it, — passing through a Jul ? 9th - 
district where forest and cultivated ground alternated. 
The slaves were busy in the fields rooting up the 
weeds from among the crops ; but, after a march of 
about four miles, we had to cross a very considerable 
water, which is here called Yali, and about whose 
course I am not able to give distinct information. 
It is said to come from Mosi, and to join the river 
Sirba not far from Bosebango ; but the latter state- 
ment is incredible. The water being not less than 
four feet and a half in depth, with a breadth of at 
least four hundred yards, most of our luggage became 
wetted. 
The country then assumed a more rocky appearance 
— mica slate, granite, and gneiss alternating, the 
granite sometimes appearing in large boulders. The 
vegetation also assumed here a more varied aspect, 
besides tamarind trees, madachi and kade predomi- 
