Abelaide Ontogoya Sectory 10

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.

By 8.30 in the morning of December 5th we entered the mouth of the Madeira River. I was surprised at the sudden change in the appearance of the two rivers. We saw in the Madeira high, gently sloping banks, covered with verdant grass and neat trees and palms along the top of them; whereas along the Amazon the trees stood almost in the water on the recently formed islands and banks. The left bank of the Madeira was of grey and reddish clay (grey below, red above), cut vertically, sometimes actually in steps. Blocks of a rectangular shape, in getting dried up, split and fell over, leaving the banks vertical. The right bank, on the contrary, was gently sloping, descending with a beautiful carpet of green grass into the stream. The islands were charming, with lovely lawns all round. Blackish and deep red rock, vertical and fluted, and with innumerable perforations, could be seen here and there, covered over with a padding of earth from ten to twenty feet deep.

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