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. In the event of occurrences of unexpected disasters, impediments, and unavoidable accidents, arising from loss of provisions or of horses, or of any injury to the health or strength of the party, rendering it utterly impracticable for the expedition to proceed as high northward as Gascoyne River, your discretion then supplying whatever you may be unprovided for in your instructions, you will explore as far as it is possible for you to do, on your return, the country north of the settled districts of York and Toodyay; so that something of utility may be accomplished, and the great object for which this expedition was prepared may not be wholly frustrated. I am further to add that His Excellency's best wishes accompany your party, and that the success of the expedition, and the return of all engaged in it in health and safety, will be hailed by him with very lively satisfaction. I have the honour to be, Sir, Your obedient servant, R.R. MADDEN, Colonial Secretary. To A.C. Gregory, Esquire, Perth. ... GENERAL REPORT OF JOURNEY. Perth, November 20, 1848. SIR,