In. 1777, Mons. de St. Alouarn anchored near Cape Leeuwin, but no details of his visit have been preserved.
In 1791, Captain George Vancouver touched on the south coast, and gave the name of King George's Sound to that well-known harbour; thence he sailed eastward. In the following year Rear-Admiral Bruny D'Entrecasteaux, in search of the hapless La Perouse, who so narrowly missed appropriating New Holland for the French, made an elaborate survey of part of our south coast.
Before the close of the century, Bass and Flinders—fit companions—had commenced their daring exploits in the little TOM THUMB, and finally, with the sloop NORFOLK, established the existence of the strait named after the enterprising young surgeon.
In the year 1799, Flinders went north in the NORFOLK sloop, and followed up Cook's discoveries in Moreton Bay. In 18oi he was appointed to the INVESTIGATOR (formerly the XENOPHON), and sailed from Spithead on the voyage which was to render him one of the leading figures in Australian history.
Reaching Cape Leeuwin he commenced his survey of the south coast, discovering and naming the two Gulfs of Spencer and St. Vincent. The former he at one time thought would lead him through the continent into the Carpentarian Gulf. He reached Port Jackson in May, the year after he left England, and active preparations were soon afterwards commenced to prepare the ship for her long northern cruise.
In July, 1802, the INVESTIGATOR, with the LADY NELSON as tender, left Sydney Cove; the object of the voyage being to thoroughly survey the eastern and northern coasts. Flinders rounded Cape York, and after a close examination of the Gulf of Carpentaria, which, like Spencer's Gulf in the south, deluded him for a time with the false hope of affording an inlet into the interior, brought his work to an end at Cape Wessel, in consequence of the rotten state of his ship. He called at Coepang in Timor, whence, after obtaining some supplies, he made for Port Jackson by way of the west coast.
Throughout this cruise it is evident that Flinders was much impressed by the notion advanced by Dampier, that New Holland (meaning the north-west portion) was separated from the land to the south by a strait opening north of Shark's Bay. "Unless," says Dampier, "the high tides and indraught thereabout should be occasioned by the mouth of some large river, which hath often low lands on each side of the outlet, and many islands and shoals lying at its entrance; but I rather thought it a channel or strait than a river." To quote the words of Flinders:—
"This opinion he supports by a fair induction from facts, and the opening of twelve miles wide, seen by Vlaming's two vessels, near the same place, and in which they could find no anchorage, strongly corroborated Dampier's supposition."
Later information had demonstrated that the supposed strait could not lead into the great ocean eastward, as the English navigator (Dampier) had conjectured, but it was thought possible that it might communicate with the Gulf of Carpentaria, and even probable that a passage existed from thence to the unknown parts of the south coast beyond the Isles of St. Francis and St. Peters.
"In the case of penetrating the interior of TERRA AUSTRALIS, either by a great river, or a strait leading to an inland sea, a superior country, and perhaps, a different race of people might be found, the knowledge of which could not fail to be very interesting, and might prove advantageous to the nation making the discovery."