370 
ALTITUDES. 
[CFAP. XII. 
lake; thus, there could be no great difference in altitude 
between the lake and the Nile where he met it, in lab 
3° 34'. Nevertheless, he found so enormous a difference 
in his observations between the river at Karuma and at 
Gebel Kookoo that he concluded there must be a fall 
betwen Karuma and the Albert Lake of at least 1,000 
feet; by careful measurements I proved the closeness 
of his reasoning and observation, by finding a fall of 
only 275 feet more than he had anticipated. From 
Karuma to the Albert Lake (although unvisited by 
Speke), he had marked upon his map, “ river falls 
1,000 feet;” by actual measurement I proved it to be 
1,275 feet. 
The altitudes measured by me have been examined, 
and the thermometer that I used has been tested at 
Kew, and its error corrected since my return to England ; 
thus all altitudes observed with that thermometer 
should be correct, as the results after correction by Mr. 
Dunkin, of the Greenwich Royal Observatory, are those 
now quoted. It will therefore be interesting to compare 
the observations taken at the various points on the 
Nile and Albert Lake in the countries of Unyoro and 
Chopi—the correctness of which relatively will be seen 
by comparison:— 
1864. FeeR 
Jan. 22. Rionga’s island, 80 feet above the Nile . » , 3,864 
„ 25. Karuma, below the falls, river level (Atada) . . 3,996 
„ 31. South of Karuma, river level on road to M’rooli. 4,056 
Feb. 21. M’rooli lat. 1° 38'river level.4,061 
Mar. 14. Albert N'yanza, lake level.. 2,720 
April 7. Island of Patooan (Shooa Moru) river level . . 3,19& 
By these observations it will be seen that from M’rooli,. 
in lat. 1° 38' to Karuma in lat. 2° 15', there is a fall of 
sixty-five feet; say minus five feet, for the Karuma Falls 
equals sixty feet fall in 37'of latitude; or allowing for 
the great bend of the river, twenty miles of extra course, 
it will be equal to about sixty statute miles of actual 
river from M’rooli to Atada or Karuma Falls, showing 
a fall of one foot per mile. From M’rooli to the head 
