Chapter VII. 
month, from the 16tli of June to the 12th of July. In this way 
the altitude of Bujongolo was established at 7,435 feet above 
Fort Portal, consequently 12,461 feet above the sea-level. The 
observations taken in the valleys and on the peaks with the 
mercurial barometer, or in places of secondary importance with 
the aneroid, were then referred to this base. A third base 
of less value, because the observations there were not taken 
during so long a period as at Bujongolo, is Ibanda in the Lower 
Mobuku Valley. Only one of the measurements of altitude 
refers to this as its base point, namely, that of the Iolanda 
Peak of Mt. Gessi, which was also taken with the boiling- 
point thermometer because the barometer was broken. 
To estimate the approximation to the actual truth, which 
may be attained by measuring heights merely by direct obser¬ 
vation of atmospheric pressure, by means of the boiling point 
of water (hypsometer), or by the aneroid barometer, it will 
suffice to compare some results obtained by this simple method 
with the corresponding measurements as taken by the Duke 
and calculated with all the corrections furnished by a base 
station. 
Locality. 
Grauer, Tegart, and Maddox. 
Wollaston. 
H.R.H. 
Observations referred 
to a base station. 
Hypsometer. 
Aneroid. 
Hypsometer. 
Mercurial Bar. 
Fort Portal 
5,200 
— 
— 
5,027 
Bihunga ... 
6,978 
6,700 
— 
6,300 
Kichuchu 
9,869 
9,600 
— 
9,833 
Bujongolo 
12,481 
12,300-12,500 
12,660 
12,461 
Camp Ctrauer 
13,303 
13,100 
— 
13,229 
Grauer Rock 
14,956 
19,030 
— 
14,813 
Wollaston Peak ... 
— 
— 
15,893 
15,286 
220 
