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But these two facts remain unshaken: That our measurements and whole science of Time depend absolutely on the operation throughout Nature of the Law of Periodicity, and that the periodicities which affect and determine animal and vegetal life upon our Earth are the periodic movements of rotation and revolution of that Earth itself.

The periodicity of earthquakes had by this time quickened to five minutes, as at midnight. A motor-car emerged under the archway of the hotel, and remained stationary outside with its engine racing.

Each day the sun is photographed at Greenwich, at South Kensington, in India, and at the Physical Observatory of Potsdam, and thus a sure record is obtained of all the spots upon its surface, which may serve for the study of the periodicity of its changes, and for their probable connection with the important phenomena of terrestrial magnetism and meteorology.

"In twenty cases various neurosal disorders had been prominent in the family and its branches, of which neuralgia, chorea, hysteria, eccentricity, mania, epilepsy and inebriety, were most common. "In some cases, a wonderful periodicity in the outbreak of these disorders was manifested.

Its definite and limited nature, and punctual recurrence, suggested to Goodricke of York, by whom the periodicity of the star was discovered in 1783, the interposition of a large dark satellite. But the conditions involved by the explanation were first seriously investigated by Pickering in 1880.

If we apply the Laws of Periodicity to the course of acute febrile or inflammatory diseases, we find that the sixth day from the beginning of the first well-defined symptom marks the first Friday-period or the first crisis of the disease, and that every seventh day thereafter is also distinguished by aggravations and changes, either for better or for worse. The Law of Sevens in Chronic Diseases

W. Lauder Lindsay, 'Edinburgh Vet. With respect to insects see Dr. Laycock, "On a General Law of Vital Periodicity," 'British Association, 1842. Dr. Macculloch, 'Silliman's North American Journal of Science, vol. XVII. page 305, has seen a dog suffering from tertian ague.

Rightly elucidated, the philosophical historian will find in it an invaluable clue to the unravelment of the tangled skein of human endeavor. Historic periodicity is on the one side an organic law of memory, dependent upon the revival of transmitted ancestral impressions.

Ely van de Warker is that "if healthy ovulation is the outcome of healthy childhood, the function will obey the law of periodicity year by year, and all this time the young woman will be able to sustain uninterrupted physical and intellectual work as well as the young man.