THE SOURCE OF THE NILE. 540 
we faw a large one, like the antelope, his buttocks (a 
confiderable way up his back) being covered with white, 
which terminated upon his thigh in a black line, drawn, 
from the haunch down very nigh to the joint of his hind 
leg. Thefe we had never feen before. They are called 
Ariel in Arabia, go in large flocks, are exceedingly 
fwift; though, from the neceflity of coming to water, 
and its only being found in particular places, they were: 
an eafy victim to thofe that watched for them at night. 
Sim Sim is a copious {pring, which fupplies a large ba-~ 
fon the Arabs have dug for it near thirty feet deep. It les. 
weft of Rafhid, or a little to the fouthward of weft... It is in: 
a fandy defert, in the direct way to Beyla and Sennaar, and 
here the Daveina kept their flocks, equally fecure from 
the fly and the troops of Sennaar, the two great.enemies: 
they have to fear; and being in the neighbourhood of Ras: 
el Feel, they keep a large market there, fupplying that. 
country amply with provifions of all kinds, and getting 
from it, in return, what they have not in.their own diftric... 
WE were juft two hours in coming to Rafhid, for we 
were flying for our lives; the Simoom, or hot-wind, having 
firuck us not long after we had fet out from Imferrha, and 
our little company, all but myfelf, fell mortally fick. with: 
the quantity of poifonous vapour that they had imbibed. I: 
apprehend, from Rafhid to Imferrha it is about five miles;- 
and though it is one of the moft dangerous halting-places 
between Ras el Fee] and Sennaar,.yet we were fo enervated,. 
eur ftomachs fo weak, and our head-achs fo violent, that 
we could not pitch our tent, but each wrapping himfelf in: 
his. cloak, refigned himfelf immediately to fleep, under 
the. 
