On arriving at the "Cawan" we saw two natives fishing in a pond with hoop nets, and Yuranigh went to ask them about the "Culgoa." He returned accompanied by a tall athletic man; the other was this man's gin, who had been fishing with him. There he had left her to take care of his nets, and, without once looking at me or the party, proceeded to conduct us to the Culgoa. I never saw a Spanish or Portuguese guide go with a detachment half so willingly. Yuranigh and he scarcely understood a word of what each other said, and yet the former had the address to overcome the usual difficulties to intercourse between strange natives, and their shyness to white men, and to induce this native thus to become our guide. He took us to the Culgoa, which we made at about seven miles from the Balonne, and I was so much pleased with the willing service and true civility of this native, that I presented him with an iron tomahawk, and I heard him twice ask Yuranigh if it really was meant for him to keep. He then hastened back to his gin, whom he had left five miles off. This river presented as deep a section as, but a narrower bed than, the one we had just left. It had all the characteristics, however, of a principal river, and really looked more important than the Barwan, except that its waters were not then fluent. Gigantic blue gum trees overhang the banks, and the Mimosa grew near the bed of the current. I should say that these and much sand were the chief characteristics of the Culgoa. There were no recent marks of natives' fires, and I was informed that they did not much frequent that part of the river. The grass along the banks was very luxuriant. Latitude 28 deg. 31' 19" south. Thermometer at sunrise, 39 deg.; at noon, 75 deg.; at 4 P.M., 76 deg.; at 9, 50 deg.;--with wet bulb, 46 deg.. The height of this camp above the level of the sea, being forty feet above the bed of the river, 543 feet; from the mean of four observations. 3RD APRIL.--The section of this river being forty feet deep, and the banks in general steep, the work necessary to render it passable to our heavy drays could not be accomplished yesterday afternoon. This day, however, our camp was established on the right bank of the Culgoa. Thermometer at sunrise, 35 deg.; at noon, 80 deg..; at 4 P.M., 77 deg.; at 9, 49 deg.; and with wet bulb, 46 deg..