642 TRAVELS TODISCOVER. 
__ I nap procured from the Englith fhips, while at Jidda,. 
fome quick-filver, perfectly pure, and heavier than the com- 
mon fort; warming therefore the tube gently at the fire, I. 
filled it with this quick-filver, and, to my great furprife,. 
found that it ftood at the height of 22: Englifh inches : fat. 
pecting that fome air might have infinuated itfelf into the 
tube, I laid it by in a warm part of the tent, covered till 
morning, and returning to bed, flept there profoundly till 
fix, when, fatisfied the whole was in perfeé order, I found’ 
it to fland at 22 Englith inches ; neither did. it vary. fenfibly- 
from that height any of the following days I ftaid at Geeth ;. 
and thence I inferred, that, at the fources of the Nile, I was. 
then more than two miles above the level of the fea ;.a pro-. 
digious height, to enjoy a {ky perpetually clear, as alfo a hot- 
fun never over-caft for a moment with clouds from rifing: 
to fetting.. 
On the 6th of November, at a quarter paft five in the 
morning, Fahrenheit’s thermometer ftood at 44°, at noon 96°. 
and at fun-fet 46°. It was, as to fenfe, cold.at night, and fill 
more fo an hour before fun-rife.. 
Tue Nile, keeping nearly in the middle of the marfh, runs: 
eaft for thirty yards, with a very little increafe of ftream,, 
but perfectly vifible, till met by the graffy brink of the land 
declining from Sacala. This turns it round gradually to 
the N. E. and then due north ;.and, in the two miles it flows 
in that direction, the river receives many fmall contributions. 
from {prings that rife in the banks on each fide of it: there 
are two, particularly one on the hill’ at the back of St Mi- 
chael Geefh, the other a little lower than it on the other fide, 
on the ground declining from Sacala, Thefe laft-mention- 
