On the 27th the cordon had been drawn so close that the escape of the blacks within the line was considered impossible, but as no reports had been made for some time of any blacks having been seen, some discontent was manifested by the hunters. On the 31st an order was issued from the camp at Sorrell rivulet to close in, and hopes were expressed that no blacks would be permitted to escape in the final rush. The following day the lines closed in, and no blacks escaped. There was none there to escape. They had slipped through the lines as soon as they became aware that they were being hunted, and the man and boy caught by Mr. Walpole's party were the only blacks captured. A proclamation was published next day, in which the Governor thanked the settlers for their services, and regretted that their efforts had not been more successful. In a despatch sent to the Colonial Secretary, Governor Arthur said, "I regret to report that the measures which I had the honour to lay before you terminated without the capture of either of the native tribes,"[25] and that was all that was said about it officially. It has been estimated that the scheme cost the colony some £35,000, but no particulars were published, and therefore all estimates of cost are mere guesses. From a humanitarian point of view it is to be regretted that it did not succeed, but the fact that it could be attempted proves how little was known of the blacks by the authorities. The fact that the blacks, who were said to be endeavouring to escape through the lines, held firesticks in their hands proves that they were then unaware of the intention of the whites, and they were probably outside the lines very shortly after it had been thus intimated to them that they were being hunted. But it is doubtful whether the race could have been preserved if they had been removed in large numbers from Van Diemen's Land. Mr. Gilbert Robertson and his successor, Mr. G.A. Robinson, succeeded in removing about 130 blacks to Flinders Island, where, although they were under the care of missionaries, they gradually died off. It was not recognised in those days that compelling the blacks to wear clothes induces skin diseases which soon prove fatal. The only way to preserve the Australian blacks is to leave them alone, and the knowledge of this fact came too late to save the Tasmanians. FOOTNOTES: [Footnote 16: History of Van Diemen's Land from 1820 to 1835.] [Footnote 17: Commission of Enquiry into the state of the Colony of New South Wales, 1822-3.] [Footnote 18: Despatch dated April 17th, 1828.] [Footnote 19: _Hobart Town Gazette._] [Footnote 20: Report of the Select Committee of the House of Commons, 1838.] [Footnote 21: Report of the Select Committee of the House of Commons, 1838.] [Footnote 22: Despatch from Governor Arthur to Earl Bathurst, dated October 13, 1831.] [Footnote 23: Report of the Select Committee of the House of Commons, 1838.]