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Alabaster Blue Sectory 09 Page 02
The descent was steep, and most trying for us among the great boulders over which we had to climb on our hands and feet. When we got to the bottom of this elevated country, the forest we found had quite a different aspect, which suggested to me the approach of the big river. We found there plenty of wild fruit, particularly some small black berries--called in Brazilian _pattaoa_--quite good to eat; also some most palatable tiny red cherries. We wasted a good deal of time picking up the fruit instead of marching, my men complaining all day long of an empty stomach. They would not take my advice to march quickly, so that we might then get plenty of food on the river. During the last few days, as I knew we must have been near the camp where I had left my men in charge of my baggage, we had constantly been firing sets of three shots--the agreed signal--in order to locate the exact spot where they were. But we had received no answer. Failing that, it was impossible to locate them exactly in the virgin forest, unless we had plenty of time and strength at our disposal.
We saw large families of _ciancias_--beautiful birds with velvety black bodies speckled with white, and fan tails of rich brown colour, feathers of the same colour being also on the outer half of the wings. They possessed slender, most elegant necks, small brown-crested heads, and light yellow chests. Seen at a distance they were not, in shape, unlike pheasants. Twenty or thirty together at a time could be seen playing among the lower branches of the trees along the edge of the river. Then there were small birds of a beautiful metallic blue-black, with very long tails; these latter were innumerable near the water.
In addition to this the earth revolves round the sun at a speed of more than a thousand miles a minute. Its path round the sun, year in year out, measures about 580,000,000 miles. The earth is held closely to this path by the gravitational pull of the sun, which has a mass 333,432 times that of the earth. If at any moment the sun ceased to exert this pull the earth would instantly fly off into space straight in the direction in which it was moving at the time, that is to say, at a tangent. This tendency to fly off at a tangent is continuous. It is the balance between it and the sun's pull which keeps the earth to her almost circular orbit. In the same way the seven other planets are held to their orbits.
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