670 
APPENDIX VIII. 
tions. Thus, although Dr. Yogel was an astronomer by pro- 
fession, fully competent to make observations with care and 
accuracy; yet, in the construction of Dr. Earth's own routes, 
south, south-east, and east from Ktikawa to A'damawa, 
Musgu, and Bagirmi, we saw good reason to reject all Dr. 
Yogel's positions bearing upon these routes, as Uje, Dikowa, 
Dilhe, Waza, Kade ( A^dishen), &c. &c., and to prefer simply 
Dr. Earth's itineraries of dead reckoning. 
Note by Dr. Barth. — In constructing the western sheet of the general 
maps, no notice has been taken of the fact of Major Laing having 
entered the desert of Tanezrufet in 23° 56^ N. {Qvarterly Review^ 
1828, vol. xxxviii. p. 101.) But we do not know whether Laing pro- 
ceeded by way of Inzize or by some other route. It is, however, not 
improbable that Aulef, the starting point of those routes, lies about 
twenty miles further south. 
The identification of Bot-hadiye with Bakel on the Senegal, is not 
quite certain ; but at all events it is a place at no great distance to the 
N.W. of it. 
