My men were paddling away with great vigour and were making rapid progress, the river flowing almost all the time northward, with deviations of a few degrees toward the east, in stretches from 2,000 to 6,000 m. in length. We crossed an immense basin 1,500 m. broad with most gorgeous sand beaches. Their formation in small dunes, occasionally with an edge like the teeth of a double comb, was most interesting. Once or twice we came to musical sands such as we had found before. Everywhere on those beaches I noticed the wonderful miniature sand plants, of which I made a complete collection.
As we went down we came to one or two seringueiros' huts, and to a store belonging to our friend the dying Jew, who rejoiced in the name of Moses. As he had taken all the stuff with him in the trading boat in order to exchange it for rubber from the collectors, he had left nothing in the store except a cheap straw hat.
As my hat by that time had lost most of its brim, and the top of it had got loose and was moving up and down in the breeze, I thought I would not lose the opportunity of getting new headgear. So the purchase was made there and then, and thus fashionably attired I started once more down stream.
We passed on the way most impressive sand banks and beaches—500, 700, and one 1,500 m. long. The river in some spots was 1,000 m. wide. A great island 4,000 m. in length—Bertino Miranda Island—was then passed, with a beautiful spit of sand 15 ft. high at its southern end. Hillocks were visible first on the left bank, then on the right. Other elongated sand accumulations of great length were found beyond the big island, one a huge tail of sand extending towards the north for 1,000 m. Beyond those accumulations the river was not less than 1500 m. across, and there an immense beach of really extraordinary beauty ran on the right side for a length of 1½ kil.
On that beach we halted for lunch. In the afternoon we continued, between banks on either side of alluvial formation, principally silts and clay, light grey in colour or white. In fact, the soil in the section directly below the higher terrace of the great central plateau of Matto Grosso, was formed by extensive alluvial accumulations which had made an immense terrace extending right across all Central Brazil from west to east, roughly speaking from the Madeira River to the Araguaya and beyond.
After we had gone some 5 kil. in a straight line from our camp to 10° b.m., we perceived a headland with a hill upon it 200 ft. high. We had been greatly troubled in the afternoon for the last two days by heavy showers of rain and gusts of a north-westerly wind. Once or twice we got entangled in channels among the many islands, and had to retrace our course, but we went on until late in the evening, my men believing firmly that we had now reached civilization again and that the journey would be over in a few days. I did not care to disillusion them.
Late at night we camped on a magnificent beach, 1,000 m. long, at the end of Araujo Island, 1,200 m. in length.
We had gone that day, August 19th, 46 kil. 500 m.
My men hung their hammocks on the edge of the forest. That camp was extremely damp and unhealthy. When we woke up the next morning all my followers were attacked by fever and were shivering with cold.
We left at 7.30 a.m. under a limpid sky of gorgeous cobalt blue. We passed two islands—one 700 m. long (Leda Island), the other 2,000 m. (Leander Island). When we had gone but 11,500 m. we arrived at one of the most beautiful bits of river scenery I have ever gazed upon—the spot where the immense S. Manoel River or Tres Barras or Paranatinga met the Arinos-Juruena. The latter river at that spot described a sharp turn from 20° b.m. to 320° b.m. We perceived a range of hills before us to the north. Close to the bank gradually appeared a large shed with a clearing near it on a high headland some 200 ft. above the level of the river where the stream turned. On the left bank, before we arrived at the meeting-place of those two giant streams, we found a tributary, the Bararati, 30 m. broad.
