It assumes various characters according to its rapidity of beat, frequency of occurrence, resistance to pressure, regularity, and perceptibility.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
This is the effect of love, as being the heat of life, to prevent its extinction, and with it the extinction of all cheerfulness, vivacity, and perceptibility of delight, grounded in its own love.
"The Delights of Wisdom Pertaining to Conjugial Love"
Emanuel Swedenborg
So, when a philosopher arose who announced a doctrine of evolution, in which the progress of matter toward perceptibility would be traced together with the advance of the mind toward rationality, in which the complication of correspondences between the external and the internal would be followed step by step, in which change would become the very substance of things-to him all eyes were turned.
"Creative Evolution"
Henri Bergson