Staple Dietary Ingredients Secured | My Web Site Page 042 Chapter 03 Page 01

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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.

The horseshoe-shaped waterfall was about 300 m. across and some 30 ft. high. When the river is full it must be beautiful, for the east side, which was then absolutely dry, is covered entirely by water, which must form a wonderful series of cascades. When the river is in flood, the waterfall, extending from north-west to south-east, has a total width of 1,000 m. There were some picturesque bits of rugged foliated rock over that great staircase, and huge cracks through which the water gurgled and foamed--those fissures formed not by the erosion of water but by volcanic action, perhaps by an earthquake. The large fall to the north-west, over which the water flows in every season, had on one side of it a steep incline, down which we took the canoe until we came to a drop about 15 ft. high.

Thus we have in these apparently random forms of the calcereous bodies, complex adaptations in which every little detail as to direction, curve, and pointing is exactly determined. That they have selection-value in their present perfected form is beyond all doubt, since the animals are enabled by means of them to bore rapidly into the ground and so to escape from enemies. We do not know what the initial stages were, but we cannot doubt that the little improvements, which occurred as variations of the originally simple slimy bodies of the Holothurians, were preserved because they already possessed selection-value for the Synaptidae. For such minute microscopic structures whose form is so delicately adapted to the role they have to play in the life of the animal, cannot have arisen suddenly and as a whole, and every new variation of the anchor, that is, in the direction of the development of the two arms, and every curving of the shaft which prevented the tips from projecting at the wrong time, in short, every little adaptation in the modelling of the anchor must have possessed selection-value. And that such minute changes of form fall within the sphere of fluctuating variations, that is to say, _that they occur_ is beyond all doubt.

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