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The latter were slowly concentrated by the reduction of their lateral elements and enlargement of the axial bone, until the force exerted by each limb came to act directly through its axis in the line of motion. This concentration is well seen e.g., in the fore-limb.
He would as soon credit a statement that the earth has no axial rotation as that Mercury or Venus has none; and if he continues his study of Eastern physics it is with no confidence in its accuracy, and as a matter of curiosity.
The tube emerging a little beyond the mouth of the cylinder, through which the expanding gases are expelled, can be slightly deviated from its axial position in any direction, and thus what little steering is required is easily effected.
They do not begin to diverge until after the medullary tube and alimentary canal, and the axial rod with the muscles between the two, have been formed. The Amphioxus continues to advance, and resembles the embryonic forms of the higher vertebrates; the Ascidia degenerates more and more, and at last, in its adult condition, has the appearance of a very imperfect invertebrate.
With the symmetry of solids, or symmetry with relation to an axial plane, no such simple movement as the foregoing suffices to produce or explain it, because symmetry about a plane implies four-dimensional movement. It is easy to see why this must be so.
Axial planning, the consideration of the relation of building to building, seem to have been outside the consciousness of Greeks of the fifth century, and each building was treated as an unrelated unit. But the inconvenience of this, its loss of opportunity, and the necessity of order and method, must have become apparent, as civilization became more complex and more exacting.
George Darwin of the theory of tidal friction in its application to planetary evolution, for this furnished a satisfactory explanation of the manner in which a body, situated as near the sun as Mercury is, could have its axial rotation gradually reduced by the tidal attraction of the sun until it coincided in period with its orbital revolution.
The merest fraction of a turn is enough to break the contact, which is all that is required. In performing this operation it is important, during the axial movements of the spindle, to adjust the halves of the thrust-block so that there can exist no possible play which would leave the spindle free to move axially and probably vibrate badly.
In consequence of these important folding-processes in the primitive gut, the simple entodermic tube divides into four different sections: 1. underneath, at the ventral side, the permanent alimentary canal or permanent gut; 2. above, at the dorsal side, the axial rod or chorda; and 3. the two coelom-sacs, which immediately sub-divide into two structures:
Here man will be evolved and perfected. Man has not yet been "born" on this earth, they say. He is still in a prenatal or embryonic condition within the animal. The lunar Pitris, the men-seed, have a physical reason for being, if this evolutionary theory be true; none if it is not. Axial rotation is necessary in evolution, the ancient physics teaches, which must cease with it.
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