We found it necessary to keep a sharp lookout here for the alligators, as they swarmed in dangerous numbers. The scarcity of fish, and the shallowness of the water did not hold out much hope that the arm we were tracing would prove of great extent; still many speculations were hazarded on the termination of it. The temperature in the night was down to 78 degrees, and the dew sufficiently heavy to wet the boat's awning through. CONTINUE EXPLORATION. Anxious to know how far this piece of water was to carry us into the untrodden wilds of Australia, we moved off with the first streak of dawn. Ten miles in a South by East direction brought us to where the width and depth was not sufficient to induce us to proceed further. Besides, as we were then only fifteen miles from a bend of the upper part of the Adelaide, which must receive the drainage of all that part of the country, it seemed improbable that any other large river existed in the neighbourhood. Six miles from our furthest, which was about thirty miles from the entrance, we passed a small island. The banks on either side of the inlet were, as usual, a thick grove of mangroves, except in one spot, a mile lower down, where we landed on our return for observations. This we found to be a low cliffy projection of slate formation, whilst scattered over the face of the few miles of country, which we are able to explore, were small bits of quartz; large blocks also of which protruded occasionally through a light kind of mould. APPEARANCE OF THE COUNTRY. The country was a most thirsty-looking level, the low brushwood on which cracked and snapped as we walked through it, with a brittle dryness that testified how perfectly parched-up was everything. A single spark would instantly have wrapped the whole face of the country in one sheet of fire. Slight blasts of heated withering air, as if from an oven, would occasionally strike the face as we walked along; sometimes they were loaded with those peculiar and most agreeable odours that arise from different kinds of gums. Still the white eucalyptus and the palm, wore in comparison with the other vegetation, an extraordinary green appearance, derived probably from the nightly copious falls of dew, which is the only moisture this part of the continent receives during the present season. The birds we observed were common to other parts of the continent, being a few screaming cockatoos, parrots, and quails, and near the water a small white egret. There was nothing of interest to recall our memories to this first visit to a new part of Australia, save a very large ant's nest, measuring twenty feet in height. This object is always the first that presents itself whenever my thoughts wander to that locality.