Limited in number as the new species really are, they will nevertheless constitute, when added to the discoveries recently made, through the medium of expeditions to the interior, from the colony of Port Jackson, very important materials to carry on that Flora of Australia, so very ably commenced by Mr. Brown. Since that eminent botanist has already advanced much important matter in the valuable essay, published at the close of the account of Captain Flinders' voyage, respecting the relative proportions of the three grand divisions of plants in Australia, as far as they had been discovered at that period, and has, from very extensive materials, given us a comparative view of that portion of its Flora, and the vegetation of other countries; I shall now simply submit a few general remarks in this notice, on certain plants of established natural families, that have been discovered in the progress of these voyages; closing this paper with some observations, chiefly illustrative of the geographical diffusion of several Australian plants known to authors, whose localities have hitherto been exceedingly limited. PALMAE. On considering the vast expanse of the continent of Terra Australis, and that great extent of coast which passes through climates favourable for the production of certain genera of this remarkable natural family, it is singular that so few of the order should have been discovered: a fact in the history of the Australian vegetation, which (upon contemplating the natural economy of many other genera of plants) can only be considered as accounted for, by the great tendency to drought of at least three-fifths of its shores.