io6 THE TANGANYIKA PROBLEM. 
A fairly reliable method is, however, afforded by a study of 
distant photographs of the range, now that the height of the 
snow-line has been ascertained. From the east the whole 
range may be seen rising from plains which stand at about 
4,000 ft. In photographs obtained from these plains 
the snow, which I ascertained to begin at 13,500 ft., only 
occupies a third, at the outside, of the total height of any 
of the peaks, above the plains. The snow-line is, therefore, 
9,500 ft. above the plains, and, consequently, these data 
indicate that 16,700 ft. is an outside height for any of the 
peaks. 
