July 7.--At eight o'clock, taking with me three men, I proceeded to follow the course of the stream; I attempted in the first instance to keep away from the banks, but was soon obliged to join them, as the morasses extended outwards and intersected my proposed course in almost every direction. About three miles and a half from the tent, a large arm extended from the north bank to a considerable distance on that side; the banks continually getting lower, and before we had gone six miles it was evident that the channel of the stream was only the bed of a lagoon, the current now being imperceptible, with small gum trees growing in the middle. Three miles farther the morasses closed upon us, and rendered all farther progress impossible. The water was here stagnant. The large trees that used to be met with in such numbers up the stream were entirely lost, a few diminutive gums being the only timber to be seen: the height of the bank from the water-line was three feet six inches; and the marks of floods on the trunks of the trees rose to the height of four feet six inches, being about one foot above the level of the surrounding marshes. It would appear that the water is frequently stationary at that height for a considerable time, as long moss and other marks of stagnant waters were remaining on the trunks and roots of the trees, and on the long-leaved acacia, which was here a strong plant. There could not be above three feet water in this part of the lagoon, as small bushes and tufts of tea grass were perceptible. The water was extremely muddy, and the odour arising from the banks and marshes was offensive in the extreme. There were only four different kinds of plants at this terminating point of our journey, viz. the small eucalyptus, the long-leaved acacia, the large tea grass, and a new diaeceous plant which covered the marshes, named polygonum junceum. It is possible that the bed of the lagoon might extend eight or ten miles farther, but I do not think it did, as the horizon was perfectly clear in all directions, a few bushes and acacia trees, marking the course of the lagoon, excepted.