I have crossed this channel twice, but must own I never measured it. It is certain, that incautious or too credulous captains are often deceived by the wideness of this vast river, which prevents them from seeing both shores of it. Trusting too much to their own fallacious calculations, they think themselves sailing on the ocean, and boldly proceed with spread sails, and without consulting the sounding-line, but at length when the ship strikes upon shoals, perceive too late that they are in the river Plata, and frequently perish. I write this on my own experience. On St. Thomas's day the ship proceeded full sail, and with a wind as favourable as could be desired. We observed little birds, never at other times seen on the ocean, flying about, bits of grass floating, and the colour of the water changed, from all which it was easy to conclude that we were near land. We represented these circumstances over and over again to the captain, a Portugueze, who, though in other respects a worthy and prudent man, relied too much on his own observations, and was somewhat pertinacious and opiniated He insisted upon it that we were far from land, and openly declared that he should pursue his present course, full sail, till seven o'clock at night. We should have perished had he acted according to his word. For about sun-set, a short-lived but violent gust of wind sprung up. All sails were lowered as usual. We perceived that the ship was surrounded on all sides by seals, which were the means of saving our lives by proving that we were in the perilous river La Plata, or at least in the entrance of it. For you will never see these amphibious animals in the main sea, it being their daily custom to quit the water and go upon shore. The testimony of the seals was also confirmed by the sounding-line, by which we discovered that the bottom was but a very few cubits deep. The captain convinced of his former error, thought fit to put in practice the maxim _festina lente_! We stuck between the hammer and the anvil, when that first squall was succeeded by a tempest accompanied with thunder and a furious south wind. Lest the ship should be driven to the neighbouring promontory of Sta. Maria, or on to the shoals, the sails were placed in such a manner that the wind when it falls into one is repelled by the other, by which means the ship, floating in the same place, is prevented from proceeding. About the middle of the night, the wind abating a little, we proceeded very slowly with but one sail. At dusk in the evening unknown tracts of land presented themselves to our eyes. At length the sun being fully risen, it was not without terror that we beheld ourselves scarce a gun-shot from the lofty rocks of the promontory of Sta. Maria. Our alarm was increased when, after repeatedly casting the sounding-line, the sailors discovered that, to the imminent danger of the ship, the bottom was but six fathoms deep. For the sea