of those annoying insects. As I slept in my clothes without any covering, I was obliged to shield my face with my pocket-handkerchief, and thrust my hands into my pockets. Although I was thus in some measure protected from their bites, it was long before I could again fall asleep, from the continued humming noise, almost as loud as that of bees, which they were making around me. When I got up at daybreak, after a restless night, I found that besides the mosquitos, I was surrounded by thousands of a small black sand-fly (_Merohy_), not much larger than a grain of fine gunpowder, but whose bites are no less irritating than those of their larger congeners. The morning tide, we found, did not rise so high as it did on the previous evening, and it was with some difficulty that the jangada was floated into deep water, which was not effected till nearly nine o’clock, A.M. In crossing the bar at the mouth of the river, we had to pass through a line of small breakers, three of which swept over the elevated platform on which I was sitting, and drenched me to the skin, thereby rendering the remainder of the voyage very uncomfortable. It was one o’clock, P.M., when we reached a little village called Peba, which is situated on the coast, about five leagues to the north of the mouth of the Rio San Francisco: this was the termination of my sea-voyage, as the heavy surf which breaks over the shallow bar of that river will not allow jangadas to enter it. The village is situated a little way inland, and is hidden from the sea by a high embankment of sand, which at this place is very much drifted by the wind; it is, however, recognised at a considerable distance, from the number of tall cocoa-nut trees which grow near the shore. I was here particularly struck with a fact which goes a great way to explain the phenomenon of the stem of a fossil tree being found passing through several strata of sandstone rock. Many of the cocoa-nut trees have their stems embedded to the depth of fifty feet and upwards in the embankment of sand which stretches along the shore, and in many places is several hundred feet broad; some of them, indeed, are so deeply embedded, that the nuts can be gathered without climbing the tree. Now as this sand has accumulated at different periods, particularly during the prevalence of the north-east trade-wind, it must present, if ever it becomes hardened, a vast number of irregularly horizontal beds, through which the stems of the palms will be found to pass.