Continued our route up the river to the south-south-west from 5.45 a.m. till 10.45, passing through open grassy box flats; a low grassy range approached the right bank and again receded; to the west a range of broken hills rose to 500 feet parallel to our course and five miles distant. Halted in the bed of the river, which formed fine reaches of water, with dry sand-bars between; caught several catfish and perch; mussels were abundant, the form of the shell much longer than I have before seen in the other parts of the river. At noon: Barometer, 29.80; thermometer, 104 degrees; at 3.0 p.m.: Barometer, 29.65; thermometer, 93 degrees. At 3.30 steered south from the right bank of the river, which turned to the westward; crossed some fine grassy country thinly timbered with box, and at 4.50 came to the southern branch of the river. This branch trended to the north-east, and consequently joins at a point lower down than where we crossed, the junction not having been observed. These two branches of the Victoria are so nearly equal in apparent size that it will remain for future examination to determine which is to be considered the tributary. Crossing to the right bank, we followed it upwards along the foot of the high land for half an hour, and encamped in the bed of the river. Latitude by meridian altitude of Achernar 16 degrees 26 minutes. RETURN DOWN THE VICTORIA. 6th December. The day commenced with a heavy thundershower, which continued for several hours; but the rain not being quite so heavy at 6 a.m., we started and proceeded along the bank of the river to a hill about one and a half miles south-west of the bivouac. On ascending the hill, we found that though the elevation and position accommodated a fine view in fine weather, yet the rain at the present time obscured all distant objects, but the country to the south and west consisted of flat-topped sandstone hills with large open valleys between; to the east the view was obstructed by rising ground, while to the north lay the vast grassy plain which we had traversed during the last two days. The western branch of the river turned to the west-south-west along the foot of the sandstone ranges, its course being marked by a line of green trees, which contrasted strongly with the white grass on the open plains on its banks. The south branch of the river appeared to come from a valley trending south-south-east, but the thick mist obscured that part of the country. As we had now examined the country sufficiently to enable the main party to advance a whole degree of latitude without any great impediment, and ascertained the general character of the country and the nature of the obstacles to be encountered, and on which the equipment of the party would in some measure depend, we turned our steps towards the principal camp, crossing the western branch of the river at 9.50, and reached our camp of the 4th at 3.20 p.m. The rain this morning cooled the air to 74 degrees at 9 a.m.