IN CENTRAL AFRICA. 319 
count ; these travel longer, and the progress of each hour 
is at the same time greater ; but 1 think it may in many 
cases be estimated at twenty-two miles, or ten hours of two 
miles and two tenths. Persons travelling in small parties, 
without reckoning men mounted on horses or dromeda- 
ries, move still quicker. 
According to Captain Lyon, the days' journeys of the 
caravans are less than twenty English miles, and above se- 
venteen ; that is to say, more than the short day, and less 
than the medium. It is not by the pace either of a pedestrian 
or of a lightly loaded camel that the progress of a caravan 
must be measured, but, on the contrary, by that of the 
man or camel bearing the heaviest burden 3 for the latter 
must be waited for by the former, and is perpetually 
retarding the march ^ otherwise the usual pace would 
be much greater than that just fixed. Besides, this 
reduction of the average value is independent of that 
which must be allowed for the deviations and turnings 
which are often unknown : another source of hesitation 
and of error to geographers. 
The earlier journeys of M. Cailhe on leaving Kakon- 
dy afford an example of the real amount of the day's 
journey : the first day, he advanced twenty-three English 
miles, the following sixteen miles and a half ; the third 
eighteen miles ; the average rate nineteen miles and one 
sixth.* The hour's journey was estimated by him at 
* The journeys of the subsequent days were shorter. 
