Mr. Rennell on the Rate of 
Some of the ordinary watering places on the Defert, being 
from 3 to 5 days journey afunder, it may be fuppofed, that 
the length of the intermediate journies, would be determined 
by the known and approved itandard of a proper day’s walk 
for a camel : for as they often arrive at the watering-place 
early in the day, it appears, that the caravan chiefs, do not, by 
any means, divide the ground between fuch watering places, 
into equal portions for marches. This being the cafe, one may 
expedl to arrive at the knowledge of what is at leaf! intended 
for a proper day’s journey for a camel, under the circumftauces 
of the cafe: and "indeed the refult is fuch as to prove what I 
have before advanced, refpefting the length of the mean journies 
of both kinds. For having fele&ed from the five above- 
mentioned journals, the length of th t apparently optional journies 
in each ; it appears, that the heavy caravans went 7 h. 51 m. 
on a mean of 24 fuch days : and the light caravans 9 h. 8 m. 
on a mean of 38 days. In both of which cafes, as might 
have been expefted, the length of the mean optional day, is 
fomewhat longer than that of the whole journey ; in which 
there is a wider field for delays and accidents. The compa- 
rifon is as follows : 
| Heavy caravan. 
Light caravan. 
Diftance in Britifh 
miles. 
Diftance in Britifh 
miles. 
H. M. 
at 2± 
per hour. 
at 2,56 j 
H. M. 
, at 
/whour. 
at 2,56. 
Mean daily rate of the 
whole journey . . 
7 27 
18,64 
19,06 
i 8 52 
22,17 
22,7 
Of optional days . . 
7 5 1 
19,62 
20,1 
! 9 8 
22,8 
23*38 
Thus 
