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As the retrograde motions of the particles of blood in the optic arteries, by spasm, or by fear, as is seen in the tails of tadpoles, and membranes between the fingers of frogs. Another cause he thinks may be from the librations to one side, and to the other, of the crystalline lens in the eye, by means of involuntary actions of the muscles, which constitute the ciliary process.
But as a greater torpor follows this exhaustion of sensorial power, as explained in the next paragraph, and a greater exertion succeeds this torpor, the constitution frequently sinks under these increasing librations between exertion and quiescence; till at length complete quiescence, that is, death, closes the scene.
Two lovers hide themselves in the evening, in the twilight, in the invisible, with the birds, with the roses; they fascinate each other in the darkness with their hearts which they throw into their eyes, they murmur, they whisper, and in the meantime, immense librations of the planets fill the infinite universe. They existed vaguely, frightened at their happiness.
We know already that our travellers, as well as astronomers generally, judging from that portion of the dark side occasionally revealed by the Moon's librations, were pretty certain that there is no great difference between her two sides, as far as regards their physical constitutions.
You are, of course, aware that in consequence of her librations, or noddings, or wobblings, the Moon presents to the eyes of the Earth a little more than the exact half of her disc. She has two motions, one on her path around the Earth, and the other a shifting around on her own axis by which she endeavors to keep the same side always turned towards our sphere.
The "librations," however, of Mercury are on a larger scale than those of the moon, because he travels in a more eccentric path.
But these shapes are in a state of perpetual and bewildering fluctuation, partly through changes in the angle of illumination, partly through changes in our point of view, caused by what are called the moon's "librations." The result is, that no single observation can be exactly repeated by the same observer, since identical conditions recur only after the lapse of a great number of years.
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