Although the several genera of plants lately observed on the north-western shores are also frequent in other equinoctial parts of the continent, there is, among the many species which are absolutely proper to that coast, a Capparis of such extraordinary habit, as to form a feature in the landscape of a limited extent of its shores, in the enormous bulk of its stem and general ramification, bearing a striking analogy to the Adansonia of the west coast of Africa. The results of such observations on the vegetation as could only be made in a general way, at parts approaching each extreme of the North-west Coast, show their little affinity to each other; for the northern extremity partakes more fully of that feature of the line of coast contiguous to it, which (as already remarked) extends along the north-western shores, declines materially at, and in the vicinity of their southern limits, where the characteristic vegetation of the south, and perhaps the west, coasts has more particularly been found. Besides Eucalyptus and Acacia, which are abundant on every shore, and generally diffused throughout those parts of the interior that have been penetrated, there is another genus almost equally dispersed, which is, however, on the North-west Coast reduced to three species. This is Dodonaea, whose maximum is certainly in New South Wales, within and beyond the tropic, upon the coast, and generally in the interior of the country, extending also to the southern extremity of Van Diemen's Land. Our very limited knowledge of the Flora of this vast continent (excepting of a part east of longitude 144 degrees, and included between the parallels of 31 and 35 degrees in New South Wales) is entirely confined to the vegetation of its immediate shores, upon every distinct coast of which, landings, more or less frequent, and under various circumstances, have been effected; although of all, very considerable portions remain unexplored, and of the line of West Coast (properly so denominated) the shores of Shark's Bay, and some few parts south of it, have alone been scientifically investigated. The interior within the tropic remains entirely in obscurity; the continental defect of a want of large streams having a distant source, to aid a penetration to the internal parts of the country, together with other effectual obstacles, draw at present a veil, and forbid all research into its Natural History and character, which will not be removed for very considerable periods (perhaps ages) yet to come!