It would appear that the finer the climate, and the fewer man's wants, the more he sinks towards the condition of the lower animals. Where the natives had passed the night, no huts, even of bushes, had been set up; a few tufts of dry grass only, marked the spot where, beside a small fire, each person had sat folded up, like the capital letter N; but with the head reclining on the knees, and the whole person resting on the feet and thigh-joints, clasped together by the hands grasping each ankle. Their occupation during the day was only wallowing in a muddy hole, in no respect cleaner than swine. They have no idea of any necessity for washing themselves between their birth and the grave, while groping in mud for worms, with hands that have always an unpleasant fishy taint that clings strangely to whatever they touch. The child of civilization that would stain even a shoe or a stocking with one spot of that mud, would probably be whipt by the nurse: savage children are not subject to that sort of restraint. Whether school discipline may have any thing to do with the difference so remarkable between the animal spirits of children of civilised parents and those of savages, I shall make no remark; but that the buoyancy of spirit and cheerfulness of the youth amongst the savages of Australia, seem to render them agreeable companions to the men on their hunting excursions, almost as soon as they can run about. If the naturalist looks a savage in the mouth, he finds ivory teeth, a clean tongue, and sweet breath; but in the mouth of a white specimen of similar, or indeed less, age, it is ten to one but he would discover only impurity and decay, however clean the shoes and stockings worn, or however fine the flour of which his or her food had consisted. What, then, is civilization in the economy of the human animal? one is led to inquire. A little reflection affords a satisfactory answer. Cultivated man despises the perishable substance, and pursues the immortal shadow. Animal gratification is transient and dull, compared to the acquisition of knowledge--the gratification of mind--the raptures of the poet, or the delight of the enthusiast, however imaginary. It is true that, amongst civilized men, substance is still represented by the yellow ore, and that the votaries of beauty "bend in silken slavery;" but are not beauty or gold as dust in the balance, substantial though they be, when weighed in lofty minds against glory or immortality? When the shadow he pursues is worth more, and is more enduring than the substance, well might it be said that "Man is but a shadow, and life a dream." Such were my reflections on this day of rest, in the heart of a desert, while protected from the sun's rays by a blanket, and in some uncertainty how long these dreams under it would continue undisturbed. "The mind is its own place, and in itself Can make a heaven of hell: a hell of heaven!" Thermometer, at 6 P. M., 90 deg..