4. After you shall have completed all your arrangements, you are to lose no time in finally departing from Wellington Valley in prosecution of the immediate objects of the expedition. 5. You are first to proceed to Mount Harris, where you are to form a temporary depot, by means of which you will have an opportunity of more readily communicating with Mr. Maxwell. 6. You are then to endeavour to determine the fate of the Macquarie River, by tracing it as far as possible beyond the point to which Mr. Oxley went, and by pushing westward, you are to ascertain if there be any high lands in that direction, or if the country be, as it is supposed, an unbroken level and under water. If you should fail in these objects, you will traverse the plains lying behind our north-west boundaries, with a view to skirt any waters by which you may have been checked to the westward; and if you should succeed in skirting them, you are to explore the country westward and southward as far as possible, endeavouring to discover the Macquarie beyond the marsh of Mr. Oxley, and following it to its mouth if at all practicable. 7. There is some reason to believe that the over-flowing of the Macquarie when visited by Mr. Oxley, was occasioned by heavy rains falling in the mountains to the eastward, and that as you are to visit the same spot at a different season of the year, you may escape such embarrassment; but although you should get beyond the point at which Mr. Oxley stopped, it would not be prudent to risk your own health or that of your men, by continuing long in a swampy country. Therefore it may be advisable for you in the first instance to leave the greater part of your men, bullocks, and baggage, at Mount Harris, and if you should see a probability of your being able to cross into the interior, you will then return to Mount Harris for such additional supplies as you may judge necessary. You can there communicate with Mr. Maxwell respecting any ulterior arrangements which you may be desirous of making. 8. The success of the expedition is so desirable an object, that I cannot too strongly impress upon you the importance of perseverance in endeavouring to skirt any waters or marshes which may check your course as long as you have provisions sufficient for your return; but you must be cautious not to proceed a single day's journey further than where you find that your provisions will be barely sufficient to enable you to reach the nearest place at which you can depend upon getting supplies. 9. If after every endeavour you should find it totally impracticable to get to the westward, you are still to proceed northward, keeping as westerly a direction as possible; and when the state of your provisions will oblige you to retreat, you will be guided by your latitude, as to the place to which you are to make the best of your way, but you are not to make for any place on the coast, if Wellington valley should still be nearer.