Along the banks of the Madeira and the Itenez, the only parts of this comarca that are well known, abundance of all kinds of game are met with. Amongst other notable trees that are seen in the large woods here adjacent to those rivers, is a species of palm, called _ubussu_, the flower of which supplies an elastic fibrous peel, so interwoven, that it appears like the production of the loom, and serves as a cap to the Indian. The _curagiru_ affords a fine scarlet dye. The cedar is common and very thick, but, like a great many other trees of excellent timber, of no use, from the almost total want of population capable of appreciating their value. In this comarca is situated the fort of Principe da Beira, erected in the year 1776, upon the right margin of the Guapore, one league below the mouth of the Tunama, in 12° 20′ south latitude, and one mile above the situation where the first governor of the province established the fort of Conceiçao. The land upon which it stands is never inundated by the river, which rises here at the period of the floods near thirty feet, and covers with lakes a great portion of the frontier lands, thus subjecting the garrison to fevers. Three hundred and fifty miles is computed from this fort to the capital; and by the river, upwards of six hundred, so considerable are its windings. Near this fort there is a populous aldeia of Christian Indians; and at a short distance higher up another, called Leonil, similarly inhabited. The whole cultivate a diversity of the necessaries of life. They also hunt and fish. Five miles below the confluence of the Guapore with the Mamore, upon the margin of the river Madeira, near the fall of Ribeiram, is the new parish of St. Joze. The inhabitants are composed of various nations, with some whites, and are abundantly supplied with fish, game, and the necessaries of life peculiar to the country. _District of_ ARINOS. This comarca, which receives its name from the river that waters it and divides it into two unequal portions, is confined on the north by Tapajonia, on the west by Juruenna, on the south by Cuiaba, and on the east by Tappiraquia. Its length is equal to that of the preceding district, and its width, from east to west, is nearly three hundred miles. A portion of the most southern part of it is commonly called Varges, or Vargeria, where, many years ago, a colony of adventurers settled, but soon afterwards abandoned it, in consequence of the annoyance they experienced from the Indians, and the want of success attending their partial operations in mining. It is a district very little known, although ascertained to be auriferous. Those who have navigated by the Arinos and Tapajos, state, that it is washed by numerous rivers, almost the whole of which contribute their waters to the enlargement of the two preceding. Its aspect is varied by mountains, and, as far as the eye of the explorer has extended, contains luxuriant and noble woods.