The following remarks from the narrative of Robert Schomburgk throw some light on the subject before us. “The Lake of Amucu,” says this traveller, “is incontestably the nucleus of the Lake of Parime and the supposed White Sea. When we visited it in December and January its length scarcely amounted to a mile, and its surface was half covered with reeds.” (This remark is found as early as in D’Anville’s map, in 1748.) “The Pirara issues from the lake west north-west of the Indian village of Pirara, and falls into the Maou or Mahu. The last named river, from such information as I was able to gather, rises on the north side of the Pacaraima mountains, the easternmost part of which only attains a height of 1500 French (in round numbers 1600 English) feet. The sources of the Mahu are on a plateau, from whence it descends in a fine waterfall called Corona. We were about to visit this fall when on the third day of our excursion to the mountains the sickness of one of my companions obliged us to return to the station near Lake Amucu. The Mahu has “black” or coffee-brown water, and its current is more rapid than that of the Rupunuri. In the mountains through which it makes its way it is about 60 yards broad, and its environs are remarkably picturesque. This valley, as well as the banks of the Buroburo which flows into the Siparuni, are inhabited by the Macusis. In April the whole of the savannahs are overflowed, and present the peculiar phenomenon of the waters belonging to different river basins being intermixed and united. The enormous extent of this temporary inundation may not improbably have given occasion to the story of the Lake of Parime. During the rainy season there is formed in the interior of the country a water communication between the Essequibo, the Rio Branco, and Gran Para. Some groups of trees, which rise like oases on the sand hills of the savannahs, assume at the time of the inundation the character of islands scattered over the extensive lake; they are, no doubt, the Ipomucena Islands of Don Antonio Santos.”