M^' LUCAS'S 
the walls is then divided into different apartments, and is co- 
vered with a roof. Thus the Ipace within the interior walls 
determines the fize of the court ; the fpace between the walk 
determines the width of the apartments ; and the height of the 
walls determines the height of the rooms. In a large houfe the 
rooms are each about twenty feet in lengthy eleven feet in height, 
and as many in width. 
On the outfide of the houfe, a fecond fquare or large yard^, 
furrounded by a wall, is ufually provided for the inclofure andl 
protection of the cattle..* 
Such is the general plan of a Bornou houfe. For the conftruci- 
tlon of the walls the following method is conftantly purfued r 
a trench for the foundation being made, is filled with dry and 
folid materials rammed in with force, and levelled ; on thefe a 
layer of tempered mud or clay is placed ; and in this fubftitute 
for mortar a fuitable number of ftones are regularly fixed. Thus; 
with alternate layers of clay and flones the wall proceeds ; but 
as. 
* In form, the houfes are fimilar to thofe of Tripoli. 
Ben Allk 
