144 
Mr. Rennell on the Rate of 
ance for halts ; which, as has been obferved before, require a 
dedu&ion of 8 parts in ioo, to be made from the grofs amount 
of the whole journey, when applied to the purpofes of geo- 
graphy. 
I have already taken notice, that Mr. Carmichael counted 
the camel’s fteps, in order to afcertain a fcale of diftance ; and 
I {hall now give the refult of his obfervations, as well as of 
Mr. Holford’s, who alfo counted the fteps, and meafured the 
length of a number of them on the ground. Mr. Hun i er’s 
experiment was on too fmall a fcale to ground a calculation on. 
It is certain, that thefe reports of the number of fteps during 
certain portions of time, and the meafurement of a certain num- 
ber of thole fteps on the ground, furnifli a relult that does not 
ar>ree with the experiments on the great fcale ; fuch as we have 
juft related, and which appear to be fufceptible of greater accu- 
racy than thofe made in detail. But it will, neverthelefs, be 
proper to give the refults, and to make fome remarks on 
them ; if be only to prevent any perfon in future from found- 
ing a calculation on them. 
Mr. Carmichael counted the double fteps, or rather the 
return of the fame foot, of a camel on which he rode, for an 
hour together, on 20 different days; at times when, from the 
nature of the ground, he thought the greateft variation took 
place, in the rate of motion. He found the greateft number of 
fteps to be 2420, the leaft 2086 ; and the mean of the whole 
20 hours, was 2200. Mr. Holford reckoned the greateft 
2240, leaft 2060; mean 2150. They both report the double 
ftep to be <; feet and an half. The refult of the former account 
is 2,29 Britifh miles per hour; of the latter 2,24; and each 
allowed his diftance accordingly, in his journal: though nothing 
is more certain than that their computed diftances fall very 
fhort 
