366 



NOETH-EAST AFEICA. 



survive of the former Egyptian, Roman, and Arab works. In some places, 

 and ■ notably near Suez, the dykes, built with such hard stone that the Arabs 

 take them for natural rocks, rise here and there some 18 or 20 feet above the plains. 



Fig. 108.— Suez in the year 1800. 

 Scale 1 : 350,000. 





50' 



3f Green w. cK Q7°^T 



Sands exposed at low water. 

 — ^-^— i— ^^^— 6 Miles. 



It is probable that to a barrage, the remains of which are still visible, the ground- 

 sill of Gisr owes its Arabic name of " dyke." 



While the mud and sands were obliterating the monuments of the Pharaohs, 

 Ptolemies, Trajan, and Amru, the Sultans of Constantinople, after the reduction of 

 Egypt, frequently entertained the idea of renewing the works of their predecessors. 



