In science, as in morals and politics, there is absolutely no periodicity.
Art, like commerce and everything else, obeys the law of periodicity.
But in accordance with the great law of periodicity, I resumed my labors in 1877-78.
The assumption of their periodicity cannot, as yet, be considered as confirmed.
The operation of the Law of Periodicity is necessary to the measurement of Time.
Periodicity, therefore, is essential to our Knowledge of Time.
Periodicity is the scientific name for the Harmony of the Spheres.
We must now institute some inquiries as to 51 the causes of the periodicity of the spots.
Millardet observed a daily periodicity of tension in Mimosa pudica.
One of them has bigger amplitude than the other, or their periodicity is different.