288 
AFRICA AND ITS EXPLORATION. 
gives the longitude as 25° 45 ; E., therefore I place 
my observation forty-four minutes of longitude farther 
east. 
The height of the veil of spray which hovers above 
the Falls I measured with a sextant and a base-line 
equal to 550 feet; the angle a was found at 50°, which 
gives for the opposite angle a the length = 655 ■ 5 feet; 
add to this 400 feet depth of abyss, and we have 1,055 
feet ascension, a result differing only by 40 feet from 
INVALIDED. 
that given by Baines. Of course, the height varies 
every day according to the volume of water in the 
river, the temperature, and the strength of the wind. 
The height above the sea-level, which at Wanki’s 
village I found to be one thousand six hundred and 
eighty feet (Baines put it at one hundred and twenty 
feet lower), I could not, unfortunately, determine from 
the boiling point of water, as my instrument broke by 
accident during the operation, and that after it had 
come safely through all the perils of such a journey as 
mine. The next morning, when I was winding up the 
