j Mr. Rennell on the Rate of 
within a very fmall fraction of Mr. Carmichael s rate ; his 
being, as we have juft feen, 2,475. _ 
I think I may venture to reft the calculation of the loaded 
camel’s mean hourly rate of travelling, on the experiments of 
Mr Carmichael and of Mr. Irwin; both of whom appear 
to have taken much pains with the detail of their jourmes * ; 
and then it will ftand as under : 
Mr. Carmichael on 322 hours 2,4751 Mean 2,47 11- 
Mr. Irwin on 193! • • 2 ’ 4 8 J tifh miles. , 
We have mentioned above, the reftilt of Colonel Capper s 
and of Mr. Hunter’s time, which gave a rate fo very near to 
Carmichael’s and Irwin’s : and it may not be amifs to add 
to thefe, the refult of Mr. Holford’s ; as well as the eftimates 
of the camel’s rate, formed by feven different perfons. All 
thefe I have placed in one point of view, in the following table. 
Carmi- 
chael. 
Irwin. 
Capper. 
Hunter. 
Hol- 
FORD. 
Plaisted. 
Anony- 
mous. 
Eftimated rates 
Brit. mi. 
2,29 
2,55 
2,25 
2,33 
2,24 
2>3 
2,5 
Experiments 
2,475 
2,48 
2,5! 
2,585 
2,5 
• 
- 
Mean of the feven eftimates, 2,35. 
Mean of the five experiments, 2 >5 l - 
Mean of Carmichael’s and Irwin’s, 2,478. 
* Mr. Irwin alfo took the bearings of his courfe by a compafs, though not fo 
much in detail as Mr. Carmichael ; but Mr. Irwin not only remarked the 
time, but the particular rate of travelling, on each day; which appeared to vary 
from .2 to 3 per hour, but was commonly ; and the mean of al! 2 >55 Brltl 1 
miles. 
Before 
