The hurricane I have mentioned, as encountered by Captain Grey in Sharks Bay, latitude 26 degrees South, occurred on February 28th, which, corresponding with the hurricane season of the Mauritius, leaves little doubt that at the same time the shores of New Holland are occasionally visited by more easterly ones, moving in nearly the same direction. The other two instances of hurricanes occurring in the neighbourhood are those of the Ceres, in 1839, in latitude 21 degrees South, above 300 miles North-North-West from Sharks Bay, and of the Maguashas towards the end of February,* 1843, in latitude 18 degrees South, about 400 miles north of the same place. Ships, therefore, passing along the North-west coast of New Holland at the season we have mentioned, should be prepared for bad weather. The hurricane experienced by Captain Grey began at South-east and ended at North-west. The lull in the centre of it showed that the focus of the storm must have passed over that locality. Captain Grey does not enter sufficiently into detail to enable us to trace the veering of the wind. (*Footnote. In volume 1 will be found mention of the bad weather met with by the Beagle in this month on the north-west coast. For further information on this subject see Mr. Thom's interesting Inquiry into the Nature and Course of Storms London 1845.) An observation I made on visiting this time the upper course of the Swan, is worth recording. Many parts were perfectly dry, more so than any I had seen on the Victoria, and yet I was informed that last year those very parts were running with a good stream. It seems reasonable to infer, therefore, that in certain seasons of the year the Victoria, though dry in some places when I visited it, is a full and rapid river. During our stay the Colonial schooner, Champion, returned from an unsuccessful search for the mouth of the Hutt River, discovered by Captain Grey in the neighbourhood of Moresby's Flat-topped Range. Near the south end of it, however, they found a bay affording good anchorage. ROTTNEST ISLAND. March 25. We moved the ship to Rottnest Island, to collect a little material for the chart, and select a hill for the site of a lighthouse. The one we chose lies towards the south-east end of the island, bearing North 76 degrees West (true) twelve miles and a quarter from Fremantle gaol. The Governor and Mr. Roe accompanied us to Rottnest, where we found that a penal establishment of Aboriginal prisoners had been formed during our absence. ABORIGINAL CONVICTS.