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 Investigator, accompanied by the Lady Nelson as tender, resumed the voyage of circumnavigation under promising auspices. Since the time of Cook the north-eastern coast had been visited in various parts by different navigators, but much yet remained to lie done before a correct map could be drawn up, and Flinders had it among his instructions to supply the deficiencies of his predecessors wherever that might be possible. Having taken the trouble to find out what portions of the coast Cook had passed in the night, he made it his business to keep a sharp lookout on such localities, and in this way became the discoverer of Curtis Bay and other inlets of considerable importance. He was able also to correct many of Cook's observations, and being provided with better instruments, supplied, in not a few cases, the shortcomings of several other predecessors. But his most valuable services in this quarter were his observations on the Great Barrier Reef, which for more than a thousand miles runs nearly parallel with the northern coast, and had hitherto been viewed as the terror of navigators. To pierce this obstruction and get out into the open sea was an undertaking of so much intricacy that seamen were accustomed to call it "threading the needle." Even Cook, prince of navigators as he was, failed in the attempt. Flinders persevered till he discovered a safe gap in the mighty rampart, and showed succeeding navigators an easy escape from a grave difficulty. An outside course was then followed to the extreme north. Having