APPENDI X. 
liii 
The Red Sea, or Arabian Gulf, as well as the whole course of the Nile, 
have been re-constructed for the present purpose. For the former, a great 
collection of new materials has been furnished by Mr. Dalrymple. This 
includes a new chart of the whole Gulf by Captain White, made in 1795 : 
but I have not followed either that or any other single authority throughout : 
but have made such alterations as appeared to be warranted, on an examina- 
tion and comparison of the different materials. 
The upper part of the Gulf, between Suez and Yambo, is however, pre- 
served entire, as Capt. White drew it. 
The position of the Gulf, is thus adjusted: 
Capt. White, by two observations of eclipses of Jupiter's first satellite, 
found the longitude of Suez to be 30 0 28' 30" east of Greenwich: and a 
mean of 76 lunar observations differed less than a minute from the former. 
The difference of longitude between Suez and Mocha, near the entrance 
of the Gulf, is, by the mean of five different accounts, 11 0 4', which added 
to 3 2 0 28' gives 43*32' for the longitude of Mocha : and which is nearly a 
mean between the different results, by timekeepers. But until a greater num- 
ber of celestial observations are taken at the mouth of the Gulf, its position 
cannot be deemed exact. 
Cape Guardafui, is placed by timekeeper observations, in 51 0 12' longi- 
tude: u° 43' of latitude. 
The adjustment of the lower part of the course of the Nile, to the shores 
of the Red sea, differs very' much from M. D'Anville's map. He supposed 
that the Nile, in its course from the lower Cataract (near Syene) to Cairo, 
gradually approached towards the Arabian Gulf: but late observations shew 
that it runs nearly parallel to it, throughout that extent, which is about 7 
degrees of latitude. Hence the distance across, between the port of Kosirc 
and Ghinna, on the Nile, is much less than M. D'Anville supposed; he 
having allowed about 110 G. miles, although go is about the truth.* 
It may be proper to state, that the line between Kosire and Ghinna is by 
no means the shortest, that can be drawn between the Nile and the Red 
* Mr. Bruce reckoned 44! hours of the caravan (with camels) between Kosire and 
Kuft (that is Coptos), near Gninna : Mr. Irwin 46 from Kosire to Eanute, s.tuated at 
