They refer to the crossing of the range.
"On the 24th of November, I followed the range of elevated mountains, where I saw several kangaroos.

This country is covered with meadows and small hills, where trees grow a great distance apart...I resumed my journey, following various directions to avoid obstacles, and at 4 o'clock I arrived on the top of a hill where I discovered that the direction of the chain of mountains extended itself north-westerly to a distance which I estimated to be about thirty miles, and which turned abruptly at right angles.

It formed a barrier nearly north and south, which it was necessary to climb over...At 7 o'clock I arrived on the summit of another hill, from where I noticed three openings: the first on the right towards North 50 West; the other in front of me, and which appeared very large, was west from me; and the third was South 35 West.
...This discovery gave me great hope, and the whole of the party appeared quite pleased, thinking that we had surmounted all difficulties, and that we were going to enter a plain, the apparent immensity of which gave every promise of our being able to penetrate far into the interior of the country...At six o'clock I found myself at a distance of about two miles from the western passage...I was then only half-a-mile from the passage, and I sent on two men in order to discover it, instructing them to ascend the mountain to the north of this passage...I waited till 7 o'clock for my two men, who related to me, that after passing the range which was in front of us we would enter an immense plain, that from the height where they were on the mountain, they had caught sight of only a few hills standing here and there on this plain, and that the country in front of them had the appearance of a meadow...At daybreak I left with two men to verify myself the configuration of the ground, and to ascertain whether the passage of the Blue Mountains had really been effected.

I climbed the chain of mountains north of us.

When I had reached the middle of this height the view of a plain as vast as the eye could reach confirmed to me the report of the previous day...I discovered towards the west and at a distance which I estimated to be forty miles, a range of mountains higher than those we had passed...From where I was, I could not detect any obstacle to the passage right to the foot of those mountains...After having cut a cross of St.Andrew on a tree to indicate the terminus of my second journey, I returned by the same route I had come." Barallier concludes his diary by mentioning another projected expedition over the mountains from Jervis Bay.