5TH JULY.--Another frosty night succeeded the day of rain, and froze our tents into boards, not easily to be packed up this morning. We proceeded along our horses' track, and the beautiful headland which appeared quite isolated, and just such as painters place in middle distance, I named Mount Salvator. We encamped on a slight elevation of the right bank of the reedy rivulet, near the pyramids. Our prospects had suddenly brightened, when instead of following chains of dry ponds, we had before us a running stream, carrying life and nourishment towards the country we were about to explore. The whole aspect of the country seemed new to us. The barometer showed we were rapidly descending, and I expected that our living stream would soon join that greater stream, the basin of which I thought I could trace in the line of mist seen from Mount P. P. King on the 28th June. The course of this river, unlike the others, curved round from N.W. towards north, and having its origin in mountains equidistant between Cape York and Wilson's Promontory, it was reasonable to suppose that we had at length crossed the division between northern and southern waters. That between eastern and western waters was still to be discovered, and in a country so intricate, and where water was so scarce then, the course of rivers afforded the readiest means of determining where that division was. If the general course of this river was found to be to the eastward of north, we might safely conclude that the dividing ground was on the west or to the left of our route; if to the westward of north, it might be to the eastward, or on the right of our route, and this seemed the more probable from the line of a river flowing north- westward, which I had seen the valley of, from Mount P. P. King. Latitude 24 deg. 50' 2". S. Thermometer, at sunrise, 16 deg.; at noon, 50 deg.; at 4 P. M., 49 deg.; at 9, 38 deg.. Height above the sea, according to sixteen observations, 1421 feet. (XLIV.)