The animals not indigenous are Man, the wild cattle, and the wild dogs. Many speculations have been hazarded as to the origin of the first: to me it appears there can be little doubt that the first tribes found their way hither from the eastern islands, having proceeded originally from India. The language of the natives bears more traces of the Hindu than of any other. This, I believe, is the opinion of the Rev. J. Mitchell, M.A., of the Middle Swan, whose long residence in India, and intimate acquaintance with some of the languages of that country, give weight to his conjectures. Many of the words used by the natives of both countries are identical in sound, and express the same meaning. I have also noticed that the Coolies of India and the natives of this colony manage to understand one another much sooner than is the case between the latter and the whites. The wild cattle have long existed in the interior, as appears from their remains. Both they and the wild dog have probably descended from animals cast ashore by shipwreck. The indigenous tribes are those of the kangaroo, the opossum, and the lizard. It is curious to observe how the distinguishing features of the first are manifested in a great variety of animals, of all sizes from the kangaroo downwards -- the long hind, and short fore legs, the three toes on the former, the rat-like-head, the warm pouch, betokening the immature parturition. The opossums also are marsupial. All these animals seem to belong to an early age of the geological world. Many of the plants speak the same language -- especially the Zamia. The rocks, too, of this portion of New Holland are all primary, except the limestone and sandstone near the coast. Is this country, then, a portion of the world that has remained in the same state for thousands, or hundreds of thousands, of years; or is it of comparatively recent formation, exhibiting that condition which at one period belonged to the whole surface of the earth? The latter, of course, must be the case; and if so, we cannot help thinking that further changes must take place in its geological character before it shall be permanently occupied by civilized man. At present, however, it must be admitted there is no sign of volcanic action going on to effect these changes. Our conjectures are purely speculative, and will probably meet with no sympathy from the reader, but we throw them out because the subject is full of wonder and mystery; and those who have brought personal observation to bear upon it, best know it to be so. As we wander through the lacustrine valleys which abound here; valleys once the beds of rivers, but now broad swamps choked up with lofty reeds -- we feel as though we were in the land and the age of the Saurians.