11TH JUNE.--Keeping along the bank of the rocky river, we were obliged to turn southward, and even S.S.E., such was the direction whence the river came. I therefore encamped the party, after a journey of only 31/2 miles, and proceeded to explore again, towards the N. W. I thus came upon the rocky river where the rock formed a bridge affording an easy means of crossing it, and this I valued more, as being the only passable place I had seen in it, so deep and rocky was the bed elsewhere. The strata at this bridge dipped N. N. E., a circumstance which induced me to travel westward instead of N. W., in hopes to cross thereby sooner, a synclinal line, and so arrive at the sources of some northern river. We passed through some scrub, and attained, by gradual ascent, considerable elevation. The country in general consisted of open forest, and contained grass in great abundance. At nine miles, I came upon a chain of ponds falling northward, and in which were two good ponds of water, whereupon I returned to the camp. Thermometer, at sunrise, 38 deg.; at 9 P.M., 38 deg.. Height above the sea, 1287 feet. (XXXV.) 12TH JUNE.--The rock about the river here was deeply impressed with ripple marks, and also dipped N.N.E. or northward. It consisted of a yellow sandstone in thin strata, covered in some parts with beds of waterworn pebbles. These consisted chiefly of quartz, felspar, and a silicious petrifaction of woody appearance. We proceeded along my horse track of yesterday. In crossing what seemed a principal ridge on which grew brigalow scrub (through which we had, in parts, to cut a way), we came upon a fine specimen of the Bottle Tree (DELABECHEA); near it grew the GEIJERA PARVIFLORA, which did not attain a greater height than 10 feet. I found by the syphon barometer that our height above the sea was here 1579 feet. By the same gauge I found that two other ridges further on were still higher (1587 feet). In the afternoon, the sky became overcast with dark, round, heavy clouds, and in the evening, slight showers fell. Thermometer, at sunrise, 20 deg.; at noon, 74 deg.; at 4P.M., 73 deg.; at 9, 60 deg.. The wind and clouds came from the west.