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Ovulation is a progressive, non-periodic process; it begins before birth and continues till the ovarian tissue is atrophied or worn out. Premonitory Symptoms of the Flow. The premonitory symptoms of the monthly flow should not be so marked as to cause the individual any discomfort. The first indication of the return of the period should be the appearance of the flow.

Whence we infer that these detached fragments of nebulous matter will continue in their original state. Non-periodic comets seem to do so. We have already seen that this view of the origin of comets harmonizes with the characters of their orbits; but the evidence hence derived is much stronger than was indicated.

In one respect we may compare these laws of heat with the laws of the tides; they are both alike non-periodic, their effects are cumulative from age to age, and imagination can hardly even impose a limit to the magnificence of the works they can accomplish. Our argument from heat is founded on a very simple matter. It is quite obvious that a heated body tends to grow cold.

He was an American, Tom Wilkins, and the first ever known to practise his profession in the South Seas. He had come like a non-periodic comet, and suddenly flashed his brass-tagged platform and arm-chair upon the gaping natives. Most of them being barefooted, one would have thought his customers not many; but the novelty of a white man doing anything for them was irresistible to all who had shoes.

The tidal consequences which we have already demonstrated are emphatically of this non-periodic class the day is always lengthening, the moon is always retreating. To-day is longer than yesterday; to-morrow will be longer than to-day. It cannot be said that the change is a great one; it is indeed too small to be appreciable even by our most delicate observations.