e every moment presented to the
eye wide sheets of water, while, as we advanced, we found nothing but
barren ground full of deep cracks. Villages, which at a distance appear
to be surrounded with water, are, on a nearer approach, discovered to be
situated on heights, mostly artificial, by which they are raised above
the inundations of the Nile. This illusion continually recurs; and it is
the more treacherous, inasmuch as it presents to the eye the perfect
representation of water, at the time when the want of that article is
most felt. This mirage is so considerable in the plain of Pelusium that
shortly after sunrise no object is recognisable. The same phenomenon has
been observed in other countries. Quintus Curtius says that in the
deserts of Sogdiana, a fog rising from the earth obscures the light, and
the surrounding country seems like a vast sea. The cause of this
singular illusion is now fully explained; and, from the observations of
the learned Monge, it appears that the mirage will be found in almost
every country situated between the tropics where the local circumstances
are similar.

The Arabs harassed the army without intermission. The few wells met with
in the desert were either filled up or the water was rendered unfit for
use. The intolerable thirst with which the troops were tormented, even
on this first march, was but ill allayed by brackish and unwholesome
water. The army crossed the desert with the rapidity of lightning,
scarcely tasting a drop of water. The sufferings of the troops were
frequently expressed by discouraging murmurs.

On the first night a mistake occurred which might have proved fatal.
We were advancing in the dark, under feeble escort, almost sleeping on
our horses, when suddenly we were assailed by two successive discharges
of musketry. We aroused ourselves and reconnoitred, and to our great
satisfaction discovered that the only mischief was a alight wound
received by one of our guides. Our assailants were the division of
General Desaix, who, forming the advanced guard of the army, mistook us
for a party of the enemy, and fired upon us. It was speedily ascertained
that the little advanced guard of the headquarters had not heard the "Qui
vive?" of Desaix's advanced posts.

On reaching Damanhour our headquarters were established at the residence
of a sheik. The house had been new whitened, and looked well enough
outside, but the interior was inconceivably wretched. Every domestic
utens