There was an innumerable flock of wild-fowl arranged in rows along the sides of the pools left by the tide, and we were again amused by the singular effect of the refraction upon them, and the grotesque and distorted forms they exhibited. Swans, pelicans, ducks, and geese, were mingled together, and, according to their distance from us, presented different appearances. Some were exceedingly tall and thin, others were unnaturally broad. Some appeared reversed, or as if they were standing on their heads, and the slightest motion, particularly the flapping of their wings, produced a most ridiculous effect. No doubt, the situation and the state of the atmosphere were favourable to the effect I have described. The day had been fine, the evening was beautiful,--but it was the rarefaction of the air immediately playing on the ground, and not the haze at sunset that caused what I have noticed. It is distinct from mirage, although it is difficult to point out the difference. The one, however, distorts, the other conceals objects, and gives them a false distance. The one is clear, the other is cloudy. The one raises objects above their true position, the other does not. The one plays about, the other is steady; but I cannot hope to give a proper idea either of mirage or refraction so satisfactorily as I could wish. Many travellers have dwelt upon their effects, particularly upon those of the former, but few have attempted to account for them. Our situation was one of peculiar excitement and interest. To our right the thunder of the heavy surf, that almost shook the ground beneath us, broke with increasing roar upon our ears; to our left the voice of the natives echoed through the brush, and the size of their fires at the extremity of the channel, seemed to indicate the alarm our appearance had occasioned. CRITICAL SITUATION OF THE PARTY. While the men were enjoying their cockles, a large kettle of which they had boiled, M'Leay and I were anxiously employed in examining the state of our provisions, and in ascertaining what still remained. Flour and tea were the only articles we had left, so that the task was not a difficult one. It appeared that we had not sufficient of either to last us to Pondebadgery, at which place we expected to find supplies; and, taking every thing into consideration, our circumstances were really critical.