Shortly after the failure of this expedition, the sad effects of a long protracted drought called forth a more general spirit of enterprise and exertion among the settlers; and Mr. Oxley makes honorable mention of the perseverance and resolution with which Lieut. Lawson, of the 104th regiment, accompanied by Messrs. Blaxland and Wentworth, conducted an expedition into the Blue Mountains. Their efforts were successful: and the objects of their enterprise would have been completely attained, but for the failure of their provisions at a moment when their view of the distant interior was such as to convince them that they had overcome the most formidable obstacles to their advance, and that in their further progress few impediments would have presented themselves. MR. EVANS' DISCOVERIES. The success of this undertaking induced Governor Macquarie to further the prosecution of inland discovery, and of attempts to ascertain the nature of the country of which Mr. Lawson only obtained a glimpse. An expedition was accordingly dispatched under Mr. Evans, the Deputy Surveyor-General, to follow the route taken by the former one, and to penetrate as far as practicable into the western interior. The result was the discovery of the Macquarie river, and of Bathurst Plains. The report of Mr. Evans was so favourable, that orders were immediately issued for the construction of a line of road across the mountains. When that was completed, the Governor went in person to fix the site of a future town on Bathurst Plains. From thence Mr. Evans, who accompanied the Governor on the occasion, was directed to proceed to the southward and westward, to ascertain the nature of the country in that direction. He discovered another considerable river, flowing, like the Macquarie, to the west, to which he gave the name of the Lachlan. The promising appearance of these two streams, and the expectation of all parties that they would be found to water rich and extensive tracts of country, led to the fitting out of a more important expedition than any which had before been contemplated. MR. OXLEY'S DISCOVERIES. Mr. Oxley, the Surveyor-General of the Colony, was appointed chief of this expedition, and was directed to trace the Lachlan and Macquarie rivers, as far as practicable, with a view to ascertain their capabilities and the nature of the country they watered. In 1817, Mr. Oxley directed his attention to the former river, and continued to follow its windings, until it appeared that its waters were lost in successive marshes and it ceased to be a river. In the following year he turned towards the Macquarie, and traced it, in like manner, until he was checked by high reeds that covered an extensive plain before him, amidst which the channel of the river was lost.