July 20.--Rested the horses to-day, having had a hard week's work, and the weather being unfavourable. Confirmed my intention of returning to Bathurst instead of the depot on the Lachlan, for the following reasons. The route up the Lachlan would be difficult and very tedious, not to say impracticable, without the assistance of boats in crossing the two principal creeks; and if it should have proved wet and rainy, it would be nearly impossible to travel over the low-lands with loaded horses. Again, our return by the route outward would not afford us any additional knowledge of the country, and presuming this river to be the Lachlan, the course and the country in the neighbourhood of the Macquarie would still remain unknown. To return to Bathurst by a northerly course would enable us to trace the Macquarie to a very considerable distance; it would give us a knowledge of the country at least two hundred miles below Bathurst; and although the difficulties we may meet with in the attempt are of course unknown to us, yet I consider it a far preferable route to returning by the Lachlan, the difficulties of which are known, and I think we may reach one station as soon as the other. To-morrow, therefore, I am resolved to set forward again up the stream, and take the earliest opportunity to cross it; when, should the inclination of its course be such as to give reason to believe it to be the Macquarie, we shall continue on the north bank the whole way to Bathurst: but, on the contrary, should its course leave it no longer in doubt that it is the Lachlan again rising from the marshes under Mount Cunningham, we shall quit its banks, and, taking a north-easterly course, endeavour to fall in with the Macquarie, which having found, I shall pursue my first intention of keeping along its banks until we arrive at Bathurst. The river has risen in the course of the night and morning about eighteen inches. We killed this day a red kangaroo, and three emus. July 21.--The stream has risen nearly eighteen inches in the night. It is extremely puzzling whence such a body of water can come thus suddenly. There must have been a great deal of rain in the eastern mountains, and the accumulated waters can be only now bending their way to the lower grounds; should the winter have proved wet to the eastward, it will undoubtedly solve the problem.