13TH MAY.--I buried a letter here for Mr. Kennedy. This day the party crossed the dividing ground, which I found to be elevated only 1563 feet above the sea, and consisting, as already stated, of fine open grassy downs, sprinkled with Acacia pendula and other shrubs. One or two knolls projected, however, and resembled islands in a sea of grass. I rode to one and found it consisted wholly of trap-rock in nodules. This was the first trap I had seen during the journey beyond the Barwan, and from their aspect I thought that other minor features of the mountains Bindango and Bindyego, which I had not leisure to examine then, also consisted of this rock. The little knoll I did visit, was about one hundred yards in diameter at its base on the plains, and was covered with trees wholly different from those in the adjacent forest, namely, CALLITRIS PYRAMIDALIS, EUCALYPTUS (Iron-bark species), etc. We next descended to a separate system of drainage, apparently falling to the north-west. Instead of following rivers upwards, as we had hitherto been doing, and finding them grow less, or taking a tributary for a main channel, we were now to follow one downwards, with the prospect of finding it to increase as we proceeded. The relief from the constant apprehension of not falling in with water was great, as each day's journey was likely to show additional tributaries to our new found river, and, of course, to augment the supply. The old native at Tagando, had pointed much to the north-west, frequently repeating the word "MARAN;" whether that was, or what was, the name of this river, remained to be ascertained. A sweet breeze from the N. W. met us as we descended the slopes, and thus it was that white men first passed in that direction, "AL NACIMIENTO DE LA ESPECERIA." Thermometer, at sunrise, 26 deg.; at noon, 75 deg.; at 4 P. M., 64 deg.; at 9, 43 deg.. Height of camp above the sea, 1226 feet.