On January 1, 1840, Dumont D'Urville sailed southward from Hobart in command of two corvettes, the 'Astrolabe' and the 'Zelee'. Without much obstruction from floating ice, he came within sight of the Antarctic coast, thenceforth known as Adelie Land. The expedition did not set foot on the mainland, but on an adjacent island. They remained in the vicinity of the coast for a few days, when a gale sprang up which was hazardously weathered on the windward side of the pack-ice. The ships then cruised along the face of flat-topped ice-cliffs, of the type known as barrier-ice or shelf-ice, which were taken to be connected with land and named Cote Clarie. As will be seen later, Cote Clarie does not exist.
Dr. H. R. Mill sums up the work done by the French expedition during its eleven days' sojourn in the vicinity of the Antarctic coast:
"D'Urville's discoveries of land were of but little account. He twice traced out considerable stretches of a solid barrier of ice, and at one point saw and landed upon rocks in front of it; but he could only give the vaguest account of what lay behind the barrier."
Wilkes of the American expedition proceeded south from Sydney at the close of 1839. His vessels were the 'Vincennes', a sloop of war of seven hundred and eighty tons, the 'Peacock', another sloop of six hundred and fifty tons, the 'Porpoise', a gun-brig of two hundred and thirty tons and a tender, the 'Flying Fish' of ninety-six tons. The scientists of the expedition were precluded from joining in this part of the programme, and were left behind in Sydney. Wilkes himself was loud in his denunciation both of the ships and of the stores, though they had been specially assembled by the naval department. The ships were in Antarctic waters for a period of forty-two days, most of the time separated by gales, during which the crews showed great skill in navigating their ill-fitted crafts and suffered great hardships.
Land was reported almost daily, but, unfortunately, subsequent exploration has shown that most of the landfalls do not exist. Several soundings made by Wilkes were indicative of the approach to land, but he must have frequently mistaken for it distant ice-masses frozen in the pack. Experience has proved what deceptive light-effects may be observed amid the ice and how easily a mirage may simulate reality.
Whatever the cause of Wilkes's errors, the truth remains that Ross sailed over land indicated in a rough chart which had been forwarded to him by Wilkes, just before the British expedition set out. More recently, Captain Scott in the 'Discovery' erased many of the landfalls of Wilkes, and now we have still further reduced their number. The 'Challenger' approached within fifteen miles of the western extremity of Wilkes's Termination Land, but saw no sign of it. The 'Gauss' in the same waters charted Kaiser Wilhelm II Land well to the south of Termination Land, and the eastward continuation of the former could not have been visible from Wilkes's ship. After the voyage of the 'Discovery', the landfalls, the existence of which had not been disproved, might well have been regarded as requiring confirmation before their validity could be recognised.
The only spot where rocks were reported in situ was in Adelie Land, where the French had anticipated the Americans by seven days. Farther west, earth and stones had been collected by Wilkes from material embedded in floating masses of ice off the coast of his Knox Land. These facts lend credence to Wilkes's claims of land in that vicinity. His expedition did not once set foot on Antarctic shores, and, possibly on account of the absence of the scientific staff, his descriptions tend to be inexact and obscure. The soundings made by Wilkes were sufficient to show that he was probably in some places at no great distance from the coast, and, considering that his work was carried out in the days of sailing-ships, in unsuitable craft, under the most adverse weather conditions, with crews scurvy-stricken and discontented, it is wonderful how much was achieved. We may amply testify that he did more than open the field for future expeditions.
After we had taken into account the valuable soundings of the 'Challenger' (1872), the above comprised our knowledge concerning some two thousand miles of prospective coast lying to the southward of Australia, at a time when the plans of the Australasian expedition were being formulated.
The original plans for the expedition were somewhat modified upon my return from Europe. Briefly stated, it was decided that a party of five men should be stationed at Macquarie Island, a sub-antarctic possession of the Commonwealth. They were to be provided with a hut, stores and a complete wireless plant, and were to prosecute general scientific investigations, co-operating with the Antarctic bases in meteorological and other work. After disembarking the party at Macquarie Island, the 'Aurora' was to proceed south on a meridian of 158 degrees E. longitude, to the westward of which the Antarctic programme was to be conducted.
Twelve men, provisioned and equipped for a year's campaign and provided with wireless apparatus, were to be landed in Antarctica on the first possible opportunity at what would constitute a main base. Thereafter, proceeding westward, it was hoped that a second and a third party, consisting of six and eight men respectively, would be successively established on the continent at considerable distances apart. Of course we were well aware of the difficulties of landing even one party, but, as division of our forces would under normal conditions secure more scientific data, it was deemed advisable to be prepared for exceptionally favourable circumstances.