15th. Steering North-East for four miles, and North-North-East for seven miles, over sandy soil, with thickets of acacia and cypress, we bivouacked on an elevated grassy spot, called Earroo, with water in granite rocks. 16th (Sunday). Rested at Earroo; horses enjoying good feed. By meridian altitudes of Regulus and Mars, camp at Earroo was in south latitude 29 degrees 23 minutes 3 seconds, and in longitude 118 degrees 35 minutes East; weather very cloudy; barometer 29. 17th. Started 7.50 a.m., and steered North 60 degrees East for about five miles; thence about North 50 degrees East for eight miles; thence North 85 degrees East for five miles, to a small grassy spot called Croobenyer, with water in granite rocks. Sandy soil, thickets of cypress, acacia, etc., most of the way. Found camp to be in south latitude 29 degrees 12 minutes 43 seconds by meridian altitudes of Regulus and Aquilae (Altair); barometer 28.70. 18th. Steering North 70 degrees East for two miles and a half, we saw a low hill called Yeeramudder, bearing North 62 degrees 30 minutes East magnetic, distant about seventeen miles, for which we steered, and camped to the north of it, on a fine patch of grass with a little rain-water on some granite rocks. At eleven miles crossed a branch of a dry salt lake, which appears to run far to the eastward. 19th. Steering about North 85 degrees East magnetic for fourteen miles, attempted to cross the lake we had been leaving a little to the southward, making for a spot supposed by us to be the opposite shore, but on arriving at which was found to be an island. As we had great difficulty in reaching it, having to carry all the loads the last 200 yards, our horses saving themselves with difficulty, and, being late, I resolved to leave the loads and take the horses to another island, where there was a little feed, on reaching which we bivouacked without water, all being very tired. 20th. On examining this immense lake I found that it was impossible to get the horses and loads across it; I was therefore compelled to retrace my steps to where we first entered it, which the horses did with great difficulty without their loads. I was very fortunate in finding water and feed about three miles North-North-West, to which we took the horses and bivouacked, leaving on the island all the loads, which we shall have to carry at least half way, three quarters of a mile, the route being too boggy for the horses. HEAVY WORK IN THE BOG.