— 97 — 
the high years 1874 and 1878 and the minimum year 1877. As far 
as the more important results are concerned, I tabulate them here 
Gauges at Assuan and Cairo. 
Date. 
1874 
1878 
1892 
1877 
Assaau. 
Cairo 
with basin 
irrigation. 
Cairo 
with perennial 
irrigation. 
Assuan. 
Cairo 
with basin 
irrigation. 
Cairo 
with perennial 
irrigation. 
Assuan. 
Cairo 
with basin 
irrigation. 
Cairo 
with perennial 
irrigation. 
Assuan. 
Cairo 
with basin 
irrigation. 
Cairo 
with perennial 
irrigation. 
August 5 
6.9 
4.9 
10 
7.4 
6.5 
5.8 
5.3 
4.9 
4.4 
6.8 
5.3 
5.1 
5.4 
4.0 
3.9 
15 
8.5 
6.9 
6.4 
7.2 
5.4 
5.2 
6.7 
5.8 
5.8 
5.8 
4.7 
4.6 
20 
8.6 
7.3 
7.8 
7.5 
6.0 
6.3 
7.4 
5.4 
6.2 
6.4 
4.6 
5.0 
25 
8.7 
7.5 
7.9 
8.1 
6.3 
6.5 
8.3 
5.8 
6.5 
6.1 
5.3 
5.5 
31 
8.7 
7.6 
8.1 
7.6 
6.6 
7.2 
8.3 
6.6 
7.7 
6.2 
5.3 
5.6 
September .... 5 
9.0 
7.7 
8.2 
8.1 
6.5 
7.5 
8.6 
6.9 
7.7 
6.3 
5.2 
5.2 
10 
8.8 
8.0 
8.3 
8.5 
6.8 
7.5 
8.8 
7.1 
8.0 
6.1 
5.3 
5.3 
15 
8.7 
8.2 
8.4 
8.9 
7.2 
8.0 
8.8 
7.5 
8.3 
6.0 
5.2 
5.5 
20 
8.4 
8.3 
8.5 
8.9 
7.6 
8.5 
8.9 
7.9 
8.3 
6.0 
5.2 
5.4 
25 
8.4 
8.4 
8.2 
9.0 
7.9 
8.5 
8.6 
8.1 
8.4 
6.3 
5.1 
5.4 
30 
8.2 
8.4 
8.2 
9.1 
8.2 
8.5 
8.4 
8.3 
8.4 
6.1 
5.3 
5.6 
October 5 
7.9 
8.7 
7.9 
8.9 
8.4 
8.6 
8.2 
8.4 
8.3 
5.6 
5.2 
5.4 
10 
7.6 
8.5 
7.6 
8.5 
8.7 
8.6 
7.8 
8.3 
8.1 
5.2 
5.0 
5.0 
15 
7.2 
8.3 
7.4 
7.9 
8.4 
8.4 
7.4 
8.1 
7.7 
4.9 
4.9 
4.6 
20 
6.6 
8.0 
7.0 
7.6 
8.1 
8.0 
7.2 
7.9 
7.2 
4.6 
4.6 
4.4 
25 
6.2 
7.7 
6.3 
7.4 
7.9 
7.4 
6.8 
7.9 
7.0 
4.5 
4.4 
4.0 
31 
5.6 
7.0 
5.9 
6.8 
7.7 
7.2 
«.3 
7.8 
6.6 
4.0 
4.2 
3.9 
7 
