leave wasted and unworked.

In geography the principal novelties are the identification of
certain ruined cities mentioned by Ptolemy, and the "Harrahs" or
plutonic centres scattered over the seaboard and the interior. I
venture to solicit the attention of experts for my notes on
El-Harrah, that great volcanic chain whose fair proportions have
been so much mutilated by its only explorer, the late Dr. Wallin.
Beginning with Damascan Trachonitis, and situated, in the
parallel of north lat. 28 degrees, about sixty direct miles east
of the Red Sea, it is reported to subtend the whole coast of
North-Western Arabia, between El-Muwaylah (north lat. 27 degrees
39') and El-Yambu' (north lat. 24 degrees 5'). Equally noticeable
are the items of information concerning the Wady Hamz, the
"Land's End" of Egypt, and the most important feature of its kind
in North-Western Arabia. Its name, wrongly given by Wallin, is
unknown to the Hydrographic Chart, and to the erudite pages of my
friend Professor Aloys Sprenger, who, however, suspects with me
that it may be the mouth of the celebrated Wady el-Kura. For
further topographical details the reader is referred to the
"Itineraries" of the Expedition, offered to the Royal
Geographical Society of London.

Some of the principal sites were astronomically determined by
Commanders Ahmed Musallam and Nasir Ahmed, of the Egyptian navy.
The task of mapping and planning was committed to the two young
Staff-lieutenants sent for that purpose. They worked well in the
field; and their sketches were carefully executed whilst under my
superintendence. But it was different when they returned to
Cairo. The maps sent to the little Exposition at the Hippo-drome