COMMUNICATIONS. 
The Currency of Cadma, like that of the Negro States to the 
South of the Niger, is compofed of thofe fmall fnells that are 
knov/n to Europeans and to the Blacks themfel\"es by the name 
of Cowries, and to the Arabs by the appellation of Hueddah. — ■ 
Cardie, which is another term for this fpecies of Negro money, 
and the fpecilic meaning of which the Shereef has neglefted to 
explain, is faid to be given to it by the idolatrous tribes alone ; a 
circumfrance that feems to indicate fuperlHtious attachment. — 
Of thefe fliells, 2,500 are eftimated in Caflma as equal in value 
to a mitkal of Fezzan, which is worth about 675 piaftres of 
Tripoli, or ten Hiillings and three half-pence fterling. 
Among the few circumftances which characterize the Trade 
of Callma, as diftinguiflied from that of Bornou, the moil re- 
markable is, that the Merchants of the former kingdom are the 
fole carriers, to other nations, of a fcarce and moft valuable 
commodity, which is only to be obtained from the inhabitants 
of the latter. For though the fait of Bornou fupplies the con- 
fumption of Callma, and of the Negro Kingdoms to the South, 
yet its owners have abandoned to the commercial aftivity of the 
Merchants of Agadez, the whole of that profitable trade. 
The lakes, on the dreary fliores of which this fcarce article 
of 
