Horizontal Distance 
from last Station. 
Station. Depth. 
0° 0-00 feet. 0 feet, 
1 18:25 ,, 220 4 
2 34:50), 1560 ,, 
3 24:33 =, 710 5, 
4 31:00 ,, 160 ,, 
5 0-00 ,, 107 
From this we calculate the following Table of hydrostatic 
pressures :— | 
Station. Hydrostatic Pressure, Ay. 
0° to 19° 12,215 cubic feet. 
es ake 559,250 ” 
PY on) 310,790 5 
Be os a! 61,627 ” 
4, 5 14,415 ie 
958,297 “5 
This result, multiplied by twice the Uruguay basin coefficient 
for 3rd February, 1871, and divided by 60, gives us 
__ 958,297 x 19-940 
@ 60 
=318,470 cubic feet per second. 
Norte III. | 
New Method of calculating the Annual Water-discharge of the 
Nile. 
1 propose, in this note, to calculate the annual water-discharge 
of the Nile from the following data :— 
1°. The actual measured maximum and mininvum discharge. 
2°. The actual measurments of depth taken from day to day on the 
: Nilometer. 
Various hydraulic theories lead up to the idea that, in large 
