"Cayley is just gone on an excursion, and you will see by his letters he is undertaking a still longer one. As he keeps all his knowledge to himself, I am hopeful you are benefited by it, and I hope much good will result from his journeys, which he is now determined on persevering in. I informed you of the refusal he gave me and Mr. Brown to his going in the INVESTIGATOR." George Cayley was a botanist sent out by Sir Joseph Banks to collect for Kew Gardens. He was industrious and painstaking in his vocation, but sadly overburdened with vanity. He made one important journey to the Blue Mountains, with the usual result. He erected a cairn of stones at the furthest point he reached, which Governor Macquarie afterwards christened "Cayley's Repulse." To return to Barraillier. Governor King, in the same, letter, further writes:-- "I have informed you in my several letters of the great use Ensign Barraillier, of the New South Wales Corps, was to me and the public. First, in going to the southward, and surveying the coast from Wilson's Promontory to Western Port, next, in surveying. Hunter's River, where he went twice, and since then in making useful observations about the settlement, and in making a partial journey to the mountains, which was introductory to his undertaking the journey he afterwards performed, but which I was obliged to effect by a ruse, as Col. Paterson had very ill-naturedly informed me that officers being at all detached from their regimental duty was contrary to some instructions he had from the Duke of York. In consequence I was obliged to give up his services after this unhandsome claim, but claimed him as my AIDE-DE-CAMP, and that the object of discovery should not be relinquished, I sent him on an embassy to the King of the Mountains." This idea of an embassy to the King of the Mountains is about as unique an incident in the history of exploration as can be imagined. Whether Barraillier reached this fancied potentate or not we are left in ignorance. Governor King says:-- "He was gone six weeks, and penetrated one hundred and thirty-seven miles among the mountains beyond the Nepean. His journal being wrote in such an unintelligible hand, I have not been able to get it translated or copied, but have sent it open under your address to Lord Hobart. . . . I have not had time to decipher and read it, but am satisfied from what M. Barraillier has done and seen, that passing these barriers, if at all practicable, is of no great moment to attempt any further at present, as it is now well ascertained that the cattle have not, nor cannot, make any progress to the westward, unless they find a passage to the northward or southward of those extensive and stupendous barriers. I intend sending M. Barraillier to Port Jarvis very soon, to penetrate into the interior from thence, if Col. Paterson is not advised to prevent it."