GEOGRAPHICAL DISCOVERY, &C. 
7 
in 1402, of the Canary Islands; Cape Nun, by 
Prince Henry, in 1412; Cape of Good Hope, in 
1486, by Bartholomew Diaz; and, including 
those to the present day, our last extended ex- 
plorations but put us in possession of information 
respecting about 28,000 square leagues of the 
superficies of Africa as a continent (and this is 
a very liberal computation.) And what is this 
extent when compared with the 1,400,000 
square leagues which it contains ? Scarcely a j 
fifth of the surface is yet visited or known. 
Or even confine this remark to Southern 
Africa, and what can we say ? A few of the 
Missionaries have penetrated to the 24th South- 
ern parallel of latitude. Messrs. Oswell and 
Livingston to 18°.20\ South Latitude. The 
general course of the Gareep or Orange Eiver 
is determined ; the Eiver Zack on its left bank, 
and the feeders of the Elephant's Eiver, more 
again to the South, have been carefully visited; 
the accurate positions of one or two great salt 
lakes in the interior, and one or two rivers 
running out of them have been recently de- 
termined: but how much yet has to be ascer- 
tained? The certain sources of both branches 
of the Kuman and Oup Eivers, that of the 
Fish Eiver, as well also as the Limpopo ; the 
connection of the various chains of mountains ; 
the issue of the Eiver ISTokannan, also of those 
