Marulan, the highest summit eastward of Jellore, consists of ferruginous sandstone, but in the country to the northward we find syenite and trap-rock. Of the latter, Nattary, a small hill north-east from Towrang and distant about four miles from it, is perhaps the most remarkable. The elevation of the country there is considerable (being about one thousand five hundred feet above the sea on the level part) and, except near the Shoalhaven and Wollondilly rivers, not much broken into ravines. It contains not only fine pasture land but also much good wheat land, especially towards the side of the Shoalhaven river. ARRIVE AT THE LINE OF GREAT ROAD. CONVICT WORKMEN. At fourteen miles from Goulburn I came upon that part of my new line of great road where the works had not been impeded by those for whose benefit the road was intended;* and here I found that the iron-gangs had done some good service. I had now the satisfaction of travelling along a road every turn of which I had studied previous to marking it out after a most careful survey of the whole country. (*Footnote. One of the most palpable consequences of the interruption my plan experienced was that it interfered with the prospects of an innkeeper whose inn had already been half built of brick in anticipation of the opening of the new line.) BERRIMA BRIDGE. On Crawford's creek I found that a bridge with stone buttresses had been nearly completed. I had endeavoured to introduce permanent bridges of stonework into this colony instead of those of wood, which were very liable to be burnt and frequently required repair. We had among the prisoners some tolerable stonecutters and setters but, until I had the good fortune to find among the emigrants a person practically acquainted with the construction of arches, their labours had never been productive of much benefit to the public. The governor had readily complied with my recommendation to appoint Mr. Lennox superintendent of such works; and on entering the township of Berrima this evening I had the satisfaction at length of crossing at least one bridge worthy of a British colony. BERRIMA. This town is situated on the little river Wingecarrabee, and was planned by me some years before when marking out the general line of road. The eligibility of the situation consists chiefly in the abundance and purity of the water, and of materials for building with the vicinity of a small agricultural population. I found here, on my return now, Mr. Lambie of the road branch of my department, under whose immediate superintendence the bridge had been erected. The walls of a gaol and courthouse were also rising, and a site was ready for the church. TRAP RANGE. November 2.