Peron and Lesueur, in Baudin's voyage, extended their inquiries chiefly among the branches of zoological research; but in that expedition each department of Natural History had its separate collector, and the names of Leschenault de la Tour, Riedle, Depuch, and Bailly, will not be forgotten. Unfortunately, the Natural History of this voyage has never yet been given to the world, the death of M. Peron having put a stop to its publication; a few of the subjects, however, have been taken up by MM. Lacepede and Cuvier, and other French naturalists, in the form of monographs, in their various scientific journals; but the greater part is yet untouched, probably from the want of the valuable information which died with its collector. M. Peron, in his historical account of that expedition, notices a few subjects of zoology that were collected by him, but in so vague a manner, that it is with very great doubt that the specimens which we procured, and suspect to be his discoveries, can be compared with his descriptions. Of the Natural History collections of Captain Flinders and Mr. Brown, no account has been published, excepting the valuable botanical works of the latter gentleman. With respect to the collection which has been formed upon this expedition, it is to be regretted that the gleanings of the Animal Kingdom, particularly of quadrupeds and birds, should have been so trifling in number; and that the students of Natural History should have suffered disappointment in what might, at first view, be fairly considered to have arisen from neglect and careless attention to the subject; but as the principal, and almost the only, object of the voyage was the survey of the coast, for which purpose a small vessel was justly considered the most advantageous, accommodation for a zoological collection was out of the question. The very few specimens that are now offered to the world were procured as leisure and opportunity offered; but many interesting and extremely curious subjects were in fact obliged to be left behind from want of room, and from our not possessing apparatus for collecting and preserving them. A botanical collector for the Royal Garden, Mr. Allan Cunningham, was attached to the expedition; and this gentleman did not fail to make a very extensive and valuable collection in his department, the whole of which is preserved at Kew. In making out the Appendix, every species brought home (excepting three or four fishes) has been mentioned, for the sake of furnishing materials for the students of Geographical Zoology. The distribution of animals is a branch of study that has been very much neglected, which is to be lamented, as it appears likely to offer a very great assistance to the systematic Physiologist; and for this reason the species found at the Isle of France have been added to the list.