about thirty-eight or forty miles, or to the northward of it in the
direction of Shark's Bay, where Dr. von Somner thought the coal-seam of
the Irwin might again make its appearance.

In the event of accident, occasioning loss of provisions and beasts of
burden, and a necessity arising for a prompt return to the settled
districts, you will bear in mind the causes of impediment on the march
which proved so disastrous to Captain Grey's party on its return from
Gantheaume Bay; the want of vigilance at night manifested in another
expedition in the murder of Lieutenant Eyre's European companion; and the
want of caution, forgetfulness of the nature of barbarians, and the
facilities for ambush afforded by a wilderness of trees and jungle, that
have led to injuries fatal to life, as in the case of Mr. Cunningham in
Sir Thomas Mitchell's expedition, and of two of his companions at another
time; and in some instances, as in those of Captain Stokes and Captain
Grey, that have led to results all but fatal to the explorers and their
expeditions; injuries suddenly and unexpectedly inflicted on individuals
straggling from the main body of their party, or venturing considerable
distances in advance of it.

You are to bear in mind that it might be of some advantage throughout
your expedition to keep a register of the depths at which water has been
found by you, and of those depths to which you have penetrated in vain
for it.

It will be requisite that you should ascertain the course of rivers of
any magnitude, and direction of chains of high land, that you may meet
with, and follow the same to some extent--at least wherever appearances
may lead you to expect improvement of soil, a richer country, or one
indicating mineral productions.