Our passage to the Duchateau Isles, a distance of less than 400 miles, has been protracted by the prevalence of light winds, although these were generally favourable, or from the westward. Occasional calms, squalls, and rain occurred, but the weather generally was finer than during the South-East monsoon. CLEARNESS OF THE ATMOSPHERE. As an instance of the clearness of the atmosphere, so different from what we had usually experienced during our former visit to these shores, it may be mentioned, that on one occasion during a light breeze from the north-west we clearly saw Mount Yule (10,046 feet high) and the summit of Mount Owen Stanley, distant respectively, one hundred and twenty, and eighty miles from the ship. On this occasion also we had a full view of the whole of Mount Astrolabe, which although 3,824 feet in greatest height, and appearing to D'Urville as he ran past to be the highest land on this portion of the coast, is rendered quite insignificant by the lofty though distant range behind. Mount Astrolabe differs in character from any other of the New Guinea mountains seen by us, indicating a different geological formation. The summit extends thirteen miles, running parallel with the coastline and distant from it about eight miles. Viewed from the south-westward the outline is regular, exhibiting a series of nearly flat tops with slight interruptions, but from the southward it appears as a succession of terraces or projecting cliffs, precipitous in front near the summit, with a long steep slope below, probably of debris, while the flat top slopes backwards with a very gentle declivity. Owen Stanley Range again presented quite a different aspect as seen on the occasion alluded to, when nearly one half of its whole length (300 miles) from Mount Yule to Heath Bay was in full view: the outline was irregular but never suddenly so, and no peaks or other remarkable points were seen. I may mention here in relation to this part of New Guinea, though not in continuance of the narrative, that the Barrier Reef, beginning (or ending) at Low Island, is continued to the southward and eastward for 150 miles, as far as Cape Colombier, generally following the trend of the coast, at a distance off it from three to fifteen miles. A long strip of apparently navigable water is thus enclosed between the reef and the shore, with numerous passages, many of which appeared to be clear to Lieutenant Yule as he passed along close to the outer margin of the reef. HARBOURS INSIDE THE BARRIER REEF. Some good harbours doubtless exist here; the Bramble passed through Roundhead Entrance and found good anchorage in fifteen fathoms immediately inside. The whole of this extent of coast appeared to be well peopled. On the western side of Mount Astrolabe, for instance, numerous villages and patches of cultivated land were seen from the Bramble. THE SAGO PALM.