Break A wheel.

In crossing a gully which entered the creek near another station, called Chilberengaba, we broke a wheel, and though we had travelled only about seven miles we were obliged to encamp, and remain until the carpenter and the smith could repair it.

Attempt to ascend Marga.

In the meantime I set out with the native guide for the summit of Marga, which proved to be one of my old fixed points.  It was about seven miles south-west of our camp; but after a most fatiguing ascent of two steep and rocky ridges, during great heat, I was obliged to return without reaching Marga.  At the cattle station we heard of a bullock which had been left by us in an exhausted state during our last expedition; and we succeeded in bringing it in, and in laying the yoke on its neck for another visit to the banks of the Darling; it was fitter than any other of our working bullocks.  I added a second species of Psoralea to that discovered yesterday, a small graceful plant with racemes of purplish minute flowers, elevated far above the leaves, and on slender stalks so tough as to be broken only with some difficulty.*

(Footnote.  P. tenax, Lindley manuscripts; herbacea, depressa, perennis, glabra, foliis glandulosis palmatim 5-foliolatis, foliolis linearibus vel lineari-oblongis obtusis, racemis cylindraceis longissime pedunculatis erectis, leguminibus ovatis scabris glabris.)

March 21.

According to arrangements made with Captain King and Mr. Dunlop, the King’s astronomer at the Parramatta observatory, I halted the party this day in order to make hourly observations of the barometer, thermometer, the sky, etc.  This plan had been strongly recommended by Sir John Herschel; and for our present purposes it was most desirable in order that we might ascertain how far the fluctuations of the atmosphere in two places so distant as Parramatta and Byrne’s creek corresponded in these simultaneous observations.  During our last journey some discrepancies in the heights determined by the barometer on the Darling led to a suspicion that the fluctuations at such great distances, in situations so dissimilar, might vary considerably; and this was now to be ascertained.

The party impeded by rocks.

March 22.

We continued our journey along the left bank of the creek, but with considerable difficulty and delay occasioned by the projection of the rocky escarpment of the above-mentioned extremities of Mount Marga; so that we had to break away masses of rock and move the carts one by one, all hands assisting.  We at length gained a pleasant tract of land on which the grass was green and luxuriant in consequence of some partial rain; and on this place I encamped with the intention of next day ascending Marga.  In the creek we found ponds, deep and clear like canals; their borders being reedy and their margins green.  In these ponds the natives speared several fishes which had however a muddy flavour.  Among them was one, apparently the eel-fish, caught during my first expedition in the Namoi and upper Darling.* This circumstance was rather in favour of the supposition that the streams unite; but still the fish seemed somewhat different.